(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.