Top Definition
1. A humorous name, term, or term of endearment for a fat, or slightly overweight, person.

2. A humorous name, or term, for a morbidly obese person, provided they don't hear you.
Woman: "Does my bum look big in this?"
Partner: "Of course it does Gigantopotamus"

From the words gigantic and hippopotamus.
See: Chunkosaurus
by Goatlips July 12, 2008
Huge, angry, basic cable dwelling she beast. Known for hatred of men and swallowing silverware while eating.
Rosie is the quintessential gigantopotamus
by shilohqdog September 03, 2010
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