Top Definition
Fat creature which is ordinarily tame but occasionally bursts into psychotic rages for no apparent reason.
Clyde: What the hell happened to you?!

Zeke: Good god, all I said was I didn't like eating at that new restaurant and she turned into a friggin' psychopotamus!
by Krakky McKraken November 12, 2006

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When someone is a huge psycho. It is a cross between a psycho and a hippopotamus. Hippos are large animals and thus psychopotamus' are huge psychos.
Claribel won't leave me alone, she's a psychopotamus.
by DrZog February 24, 2011

The Urban Dictionary Mug

Lotsa space for your liquids.

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The Urban Dictionary Mug

Lotsa space for your liquids.

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The Urban Dictionary Mug

Your favorite word on a white mug.

Create a mug

The Urban Dictionary Mug

One side has the word, one side has the definition. Microwave and dishwasher safe. Lotsa space for your liquids.

Buy the mug

The Urban Dictionary T-Shirt

Soft and offensive. Just like you.

Buy the t-shirt

The Urban Dictionary T-Shirt

Smooth, soft, slim fit American Apparel shirt. Custom printed. 100% fine jersey cotton, except for heather grey (90% cotton).

Buy the t-shirt