Aggravation; bother.

(chiefly UK, Australia) Aggressive behaviour; loud, intimidating behaviour that convincingly threatens violence without necessarily actually becoming violent.

(online gaming) A measure of how belligerent a player is – a high value may inspire either avoidance or preemptive hostile action from enemies.

(online gaming, MMORPG slang) Hostile attention from an enemy that should target players with better defenses.

(online gaming, MMORPG slang, intransitive) To become aggressive towards the player's character.

(online gaming, MMORPG slang, transitive) To cause (a non-player character) to become aggressive towards the player's character.

(Australia, New Zealand, slang) Angry.

(online gaming, MMORPG slang) Liable to attack without being attacked first (said of monsters).

(Britain, US, slang) Hardcore, aggressive.