Circlemouth

An individual who becomes overly talkative when drunk; term is used, however, for a much deeper defect of character whose symptoms are antisocial behavior and a tendency to blame others for things they didn't do.

The term is to be used as a proper monicker as well as a generic.

A: Jim told me he didn't want to go to breakfast with us. But when we got back from Shoney's he asked us why we didn't take him to breakfast!.

B: Ah, fergit it. That's just Circlemouth.

A: He's a circlemouth all right.