Definitions by Girl Interrupted

Hippocrotamus 

A person with an ego of mammoth proportions, too large to fit the standard "hypocrite" label.

Girl 1: I can't believe Mary had sex with Jamie after they've only dated a month, what a slut.

Girl 2: Didn't you hook up with some guy you'd known for 2 hours last weekend? You're a hippocrotamus.

Hippocrotamus by Girl Interrupted August 30, 2010