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.
by Girl Interrupted August 30, 2010
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An enormous hypocrite. Someone that has reached such extreme levels of hypocrisy that it is all prevailing, dangerous and out of control, like a rampaging hippopotamus.
I can't believe you put cheese on your vegan burger, you're such a hippocrotamus!
by Harrisimo December 22, 2019
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