This slang word is used to describe a male who is known for screwing on other peoples girlfreinds/manishee's, etc, Especially when the girls boyfreind/husband cannot do anything about it. If imprisoned for instance, or on active duty in the army. And most often than not will have moved on to the next poor guys girlfreind within a few months and the fun wears off as the thrill of the misadventure dwindles.

Literally everyone, ever. Including the writer of this definition.