Typically a man with a chip on his shoulder. Originally an Irish term it has now spread internationally.
He likes to make fun of his friends and belittle the weak and vunerable in society. Doing a PJ usually involes calling people names and using racist terms against people.
- He insulted her and called her a jap, talk about Doin'a PJ on it.
- "You are such a mongjaws" - oh stop trying to do a PJ on it.
- He was Doin' a PJ on it when he insulted her family, called her ugly and posted up stuff about her on the web.