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1.
to be angry or hostile for no reason
"that pitbull is fuckin' agro"
by lola May 22, 2004
 
2.
(verb) To create hostility in others, causing them to attack you. This is frequently seen in MMOG's (massively-multiplayer online games) when a player draws the attention of one or more hostile NPC's (non-player characters) and is attacked by them. Also seen is the "chain agro", where the hostile NPC who was agroed causes the next nearest NPC to also agro on the player, setting up a chain reaction.
"Stay against the left wall to avoid agroing the goblins." "Look at that idiot, he just ran ahead and agroed the whole room."
by Mugsley December 07, 2005
 
3.
Misspelled. See aggro.
People can't spell "aggro" right.
by inkdrinker December 08, 2004
 
4.
Undeserved hostility, one who expresses it, the act of it, etc. Seen in MMORPGs by players to complain about being attacked by a monster without them attacking it first. Can be a noun, verb, adjective, possibly adverb.
"Someone kill this agro!"
"OMG WTF DIS ZOMBY IS LYKE AGROING ME"
"Someone kill this agro zombie!"
"This zombie is attacking me agro"
by junkyardprince October 14, 2003
 
5.
To be/become agressive/angry/out of control.
"That gummer's comlpetely agro!"
by Crapper McGee January 23, 2004
 
6.
The name of Wander's--the main character--horse in Shadow of the Colossus, significant if only because the AI engine that dictates his behavior is, by far, one of the most complex and realistic animal behavior engines to date. The horse is not without its eccentrics, however, and is prone to rather confusing responses when you issue him commands.
On foot, it will take forever to reach this Colossus. Riding Agro might reduce that time by half if I can ever get him to come over here!
by Jason Robertson March 12, 2006
 
7.
Short for aggravation
Your friend is too much agro
by m-anonymous (agro) July 22, 2009