In an MMORPG when you "piss off" an NPC(non-player character) and it enters a combat state with your character. Most often used when multiple NPC's are attacking you because you got too close or you attacked them.
"I just aggro'd 15 level 80's! I need a heal!"
noun;
1 aggressive behaviour usually in the context of football related disorder.
2 to experience difficulties
abbreviation of aggravation
1 John: "How did you get on at Spurs on Saturday?"
Dave: "We beat them again and had all the usual aggro with the 'Yids' outside."
2 John: "Why don't we just get the bus to Spurs from Finsbury Park"
Dave: "Because every time we do that we get marched down Seven Sisters Road like cunts and get loads of shit off the old bill. Fuck that, I don't need all that aggro."
a term that has been used for decades by surfers and other water-headed types to describe someone who is overly and unesscessarily agressive, competitive, or assinine whilst in the water. prolonged exposure to the aggro can ruin even the best session, so "deal" with them immediately (read: choke with your leash then return to your state of zen-like calm once they are dead)
Watch out for those SoCal types, theyre aggro, they should stay in Cali where they fucking belong.
In MMORPG's and MUD's, means that an NPC will attack pre-emptively, instead of only returning an attack.
"That new monster they put in the newbie area is aggro."
60's British slang for aggravated and aggressive.
Today usually describes an RPG or real life male who's physically aggressive and is "picking a fight".
The football fans went aggro after the game because a referee red carded the player who made the winning goal.