Mangina or Man-gina would be gay slang for anus, ass or man-cunt. Often used on the leather scene but on the whole it is a generic term for a guy's butt hole.
that guy gets so much action his man-gina is like a inner tube.
An illusion where a man "tucks his stuff" (i.e., hides his genitalia between his legs) thereby giving his pubic region the apperance of that of a female's.
The insane popularity of this trick is usually traced to (credited to or blamed on) the 1991 Jonathan Demme movie "The Silence of the Lambs"
"I saw a man-gina contest on spring break in mexico ... they had 5drunk guys tuck in their stuff and drop trou on stage."
The correct pronunciation of the New York Jets Coach Eric Mangini's last name. After being a NE Patriotscoach, he is now whining about how the Pats' coaches analyze the competition.
Eric Man-gina is bitching about how wrong it is to bend the rule he bends, what a tool.