An act that causes you to be excluded from the rotation at a party, usually a faux pas.
John dropped the bong. "Whoah, party fowl!" James exclaimed.
A party fowl is a bird that can hold its liquor exceptionally well for an animal. Usually a duck or pheasant.
Or, party foul spelled wrong.
guy 1: "MAN, that pheasant is going nutz on that PBR!"
guy 2: "yea, what a party fowl!"