noun; back formation
a state of being hostile or violent, usually possessing intentions to harm others
This term is not quite simply a clipping of the word aggression because no definite cut on the word will have the "ro" ending. It is a word often used by the gaming community to comment on another players action as being aggressive and hostile. Aggro is often due to a quest for revenge against another player.
Etymology : A back-formation of the root words agression, from Late Latin aggredi, meaning "to approach, attack".
Source : "Whoa, somebody has aggro!" Person commenting on the actions of another during gameplay (09/07)
Last modified: 5 December 2008