a fat vagina and/or upper vagina region
Ryan: When I got home I found out that girl from the bar last night, was a major hippotwatamus
Jeff: Oh yeah, I went on spring break with her and wasn't sure if she had a penis or not.
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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.
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(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!
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