Eric Mangini is the current Cleveland Brown's coach and he once said that "He was going to take the Browns to the Super Bowl." While this is never going to happen it has become a popular euphemism for dropping a duece. It also provides a nice cover when talking around girls as they do not typically know who eric mangini is.
Guy 1: Bro i got to pull a mangini if you know what i mean.
Guy 2: Ya i got ya
Girl 1: What does that mean?
Guy 1: shhhh, go make me a sandwhich.