Someone who instigates a problem or troublesome event, and then quickly leaves or runs off before it can be resolved, leaving other people to handle it. Normally, This is done out of a sense of amusement, usually only to the benefit of the offender.
Named for the song, "Haulass Hyena", By The Cramps.
"Johnny told my girlfriend I was having an affair with one of my coworkers, then ran off laughing before I could say anything!"