When a raid boss in an MMORPG (such as World of Warcraft or EverQuest) has an ability that reduces the tank's aggro by a fixed percentage. Since a tank can only build up a certain amount of aggro in a fixed period of time, and since the boss performs this aggro-reducing ability periodically, there will be a maximum amount of aggro a tank can produce.

In WoW, this first appears on Broodlord Lashlayer in Blackwing Lair, since previous aggro-reducing bosses reduce a fixed amount of aggro, rather than a percentage. It also appears on the three drakes, Firemaw, Ebonroc, and Flamegor.

Other players (besides the tank) must be careful to control their aggro on aggro ceiling fights so as not to pull aggro, since they are not being hit with the aggro-reducing ability.
Careful to keep dps low when we're fighting Broodlord or you'll hit the aggro ceiling.
by alexaz March 22, 2006
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An alternative term for Nu Metal, a genre that emerged in the late 1990s.
"Linkin Park grew out of the aggro metal sound by the late 2000s."
by AliceInChains98 July 4, 2014
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1. The final obstacle course in Nickelodeon’s GUTS, in which contestants had to climb the Aggro Crag and light the actuators.

2. A house in Bowling Green, OH. It is frequented by students of BGSU, but has also hosted guests from The Netherlands, Germany, and Japan. Known for the best parties and the worst hangovers.
Dude, all I remember from last night was going out to the bars, but this morning I woke up at the Aggro Crag wearing a wet suit and scuba gear.

Where is the party to go to this weekend? Same place as always, the Aggro Crag!
by bstaple September 26, 2009
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The hassle you get from your significant other while trying to play a MMORPG.
While playing WoW, you say to your guildies, "I'd love to go on this raid with you but I've got spouse aggro."
by Lunalta May 22, 2006
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Common World of Warcraft condition wherein a player's Girlfriend, wife, or significant other (GF) is or will become angry (Aggro) due to continued time in the game.
Them: LF Tank, quick VOA 25...

Me: no can do, GF Aggro. {/logout}
by Whisperwind Bahb July 30, 2009
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When you child walks in while you are busy and dominates your time, preventing you from doing what you were doing. Especially when playing a game, watching tv, or other activities.
Dad into headset: "Quick, heal me while I taunt that mini-boss."
Kid: "Daddy, I have to go potty. Can you keep me company?"
Dad into headset: "I'll brb"
Voice from headset: "Dude, you got the kid aggro!"
by Lomanbjorn January 9, 2013
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rage + emo = aggro
Paul: "Leave Britney alone.. OR I'LL KILL YOU."
Liz: "Dude.. why are you so aggro?"

by Pythoness December 16, 2007
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