A person who has just been brutally beaten or pummeled. (Dominican speakers often drop the d in words ending in ado, turning reventado into arreventao).
That poor guy you saw on the corner is an arreventao, they really beat the hell out of him.
To harass, mistreat, or pick on someone, essentially synonymous with bullying or messing with someone. (The term is derived from a derogatory reference to Jewish people, though it is used colloquially in Argentina to mean general harassment).
One of the two participants in the sado-masochistic game of domestic violence: the one who, out of pure spite, hits harder while the partner who joins them in the game plays the victim and tries to pretend they have no part in the matter. It is a term coined by psychologists to justify the actions or inactions of the supposedly abused person who chooses to participate in the cycle of violence and then does not know how to get out of the mess they entered.
Maltratador and the one being abused are two sides of the same coin.