A slang phrase in the New England area; perhaps most frequently heard in Boston, whose closest meaning is "Awesome". However; the phrase is almost exclusively used in the sarcastic sense.
Man 1: "Sorry bro, I need yah to cover my shift tomorrow."
Man 2: "WickedPissah; Not like I had tickets to the socks game or anything."
12 step recovery jargon referring to someone new who talks about how great life is, now that they're sober. Usually meaning that the person is out of touch with reality.
The new guy seems pretty happy for a dude who has no job, no money and no family. He must be on a pink cloud.