paulie thought he was doing the one gallon challenge with milk, but little did he know that wally pulled a dirty flanny
the act of filling a 1 gallon milk jug with cow semen and an irishman's piss, then giving it to a person you dislike to consume
"paulie thought he was doing the one gallon challenge with milk, but little did he know that wally pulled a dirty flanny" What is the definition of "dirty flanny"?