Top Definition
(noun)
1) A big, gaping cockhole twat asshole vag

2) A derogative term for that person you know who is a major slut - either male or female ho bottom
Geez, all those cracked-out, crystal-driven fuckfests with random men has really made him / her into a hippotwatamus!
by aaaangus June 18, 2009
A large woman who is unreasonably bitchy, Ill-tempered, or generally foul in nature.
Frank: That fat bitch over there is trying to cockblock me from getting with her hot friend.

Billy: Oh, that's just Lisa, being a Hippotwatamus again.
by Jades5150 February 29, 2016
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