(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.