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hippopotamus 

a fat water cow
hippopotamus by Schnerd February 26, 2003

Hippopotamus 

Q: Is a hippopotamus a hippopotamus or just a really cool opotamus?

A: A really cool Opotamus!
Hippopotamus by Entr' Acte December 24, 2009

hippopotamus doorknob 

Noun. A process in which a person shoves an umbrella in his or her anus, and then promptly opens it up, thus making his or her asshole larger. The misguided soul then proceeds to put watermelon-sized anal beads into his or her rectum. This being must then try to regurgitate these objects into a friend's mouth. Finally, the friend runs to the nearest zoo naked and gets impaled by a rhinoceros.
- Damn son, why you so stressed today? Did ya take a hippopotamus doorknob recently?
- Yes, my anus is still sore.
- I'm sorry for your loss.

hiphopotamus

A label for an individual who represents all things hip hop. Tongue-in-Cheek.
Yo, dude is a true hiphopotamus!
hiphopotamus by Nicemag February 13, 2009

herpopotamus

A fat chick that gives you herpes.
Ryan: Yo tom did you get with that herpopotamus last night?

Tom: yea that fat chick gave me herpes
herpopotamus by Killerkyle412 October 15, 2013

hippopotamus plunger 

the act of taking a shit on your hand then making a fist and shoving it inside a guys/girls ass and thrusting it back and fourth
I totally just did the "hippopotamus plunger" and she loved it