Thing heard in game or apply to things in game
b = back, fall back, they're coming for you
back = fall back, they're coming for you
care = be careful, they may be coming for you
oom = out of mana
focus = To target a player. Meaning that as a team you all will all focus on a specified hero to kill first.
top, mid, bottom = the lanes in LoL. With the flip camera option, the top and bottom may be switched for some people.
lane = the road like expanses that contain towers and lead to and from the bases
river = The river which cuts across the map diagonally
jungle = The mass of trees and paths that exist between the lanes
neutrals = The creep-enemies who live in the jungle
bp, pill, pilling = blue pilling, going back to base
base, basing = blue pilling, going back to base
shop,buy = To go back to base to go shopping
brush/grass = The large grass in LoL which causes your hero to be hidden to people outside of the brush
sigils = Temporary buffs granted to a player by defeating the Golem and the Elder Lizard. These buffs transfer to the killer in the event that the hero dies with the sigil.
buff = Typically a temporary increase to some stat(s)
passive = An ability which is not activated but helps a character. For example, Morgana's passive allows her to heal a small % of the damage her spells inflict. Passives usually apply only to the hero who has them.
aura = A 'passive' which applies not only to the hero who has it, but also to heroes within the given range for the aura. A shareable passive.
dd = direct damage ability. Typically DDs are unavoidable: Click ability, click target, profit. For example: Annie's Q fireball.
skillshot = an ability that fires a projectile that can be dodged. For example: Morgana's cage, Ashe's ultimate arrow
aoe = area of effect
pbaoe = point blank area of affect. The area of effect is centered around the caster such as Nunu's Ultimate or any aura.
backdoor= To attack the enemies towers and base without the cover of your creeps there
ult = ultimate ability. The R Ability.
unique = In LoL certain auras/passive are unique, meaning they do not stack.
last hit = Getting the very last hit, or killing blow.
AP = Ability Power. The stat which boosts the effectiveness of abilities.
miss, mia = Missing, missing in action. Commonly used to describe when a hero is missing from a lane and may indicate to the team that a gank may happen.
juke, juking = When being chased, juking is to fool your pursuers. Typically this happens in the jungle. A successful juke could range from eluding the enemy by exploiting line of sight, or could simply cause the enemy to mistarget a spell.
feed = A player who dies constantly feeds the other team (via the gold reward for killing someone). Being called a feeder is not a compliment. A player who is fed has a lot of kills.
gg = good game.
gj = good job.
ms = movement speed
Rammus = the best character ever who is also a flippin' ninja.
baron, nashor, worm = the big worm like boss that gives a noticeable buff to the whole team when killed.
gl hf - good luck, have fun, usually an encouraging sportsmanlike phrase said before a game, sometimes sarcastically used "gl solo baron"
gl hf dd (insert acronym) = good luck, have fun, don't die, [confusion tactic] (I suppose this is just a Hargaad thing)
push - to gather up a creep wave and attempt to destroy an enemy tower "I'm going to push bottom"
d, defend - to sit at a tower and/or inhibitor and attempt to avoid confrontation while stopping the enemy from killing the objective "I'm gonna d mid"
gank - to go (often with more than one player) to try and kill an enemy, often by surprise "lets gank bottom"
tp - summoner spell telleport used to traverse the map "Ill tp back in"
heal - either the summoner spell, a champion ability, or the act of returning to base to regenerate HP and mana "you should heal"
harass - to annoy the enemy with small bursts of non lethal damage, often forcing them to go heal or be set up for a gang.
bait - to deliberately appear in a position to be easily ganged so as to lure 1 or more players to be gangked by your team "go bait them in to the jungle"
Disable = A Disable is a debuff that usually prevents some kind of action on the player. Stuns, roots, silences are all examples of disables
Stun = A debuff which prevents any action by a champion (summoner spells excluded)
Root = A debuff which prevents any movement by a champion (summoner spells excluded)
Silence = A debuff which prevents any abilities being used by a champion (summoner spells excluded)
Farm = Farming involves the amassing of gold for player. This is usually best done by killing a lot of creeps and killing them very quickly. Certain Heroes like Ashe and Tristana are great farmers: The first has a +gold passive, and the latter has an AOE passive.
leash/pull - when someone other than the jungler attacks a jungle creep so that it comes towards them while the jungler attacks it; the leasher leaves the range so the jungle creep returns to the jungler; allowing several free hits/spells on the creep for the jungler.
Things heard outside of the game or apply to outside of the game
vent = Ventrilo. It is voice communication software used to coordinate as a team. LoL has its own vent server: See the sticky in the beta general for more information.
build = how a champion and its summoner is built. For champions this may includes the items one buys on a champion, and the order one gets a champion's skills. For summoners, this refers to their masteries and rune selections.
carry = A character who, if played properly, wins late game fights for a team. Typically these heroes are weak early game and require a lot of farming.
tank = Character with a lot of HP and likely armor/resistance. Whose job is to initiate battles with the enemy players/turrets as to draw damage onto himself.
dps = Damage per second. Also referes to characters who job it is to deal damage (As opposed to support and tanks)
burst = A large volume of damage done quickly and typically then very little sustained follow up damage.
support = Characters who job it is to support other characters: Healers, buffers, etc
runes = Refers to LoL's rune system, however this term is overloaded and some players also refer to sigils as runes
talents = A non-canon term for masteries
mastery, masteries = The talent-tree system of LoL
DotA = Defense of the the Ancients. A mod for War3 that virtually launched the moba genre
HoN = Heroes of Newerth. Another moba game that is in direct competition with LoL.
moba = multiplayer online battle arena
elo = The score a person has in the Ranking system. http://en.wikipedia.org/wiki/Elo_rating_system
leave, leaver = To quit a game before it is over.
raqequit, qq = To quit a game in anger (Being killed, losing)
disc, dc = disconnect from a game.
adjudicator = Either an older beta tester, or a beta tester whose skill in game or feedback out of game have been noted.
skin = Items that give a Champion a new look (Costumes, clothes, etc)
champion = The particular character that you as the summoner control
hero = non-canon name for a champion
summoner = Your representation in the game. Essentially you are the puppet master of your selected Champion and you have your own summoner abilities along with the champion's abilities.