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1.
Very big. Huge. It's a mix between the words giant and humongous.
Her head was just, big... but her tatas were gibongous!
by k-fred September 02, 2007
4 0
 
2.
A) Extremely enormous, bigger than normal. Usually used to described a guy who's penis is either over girthed or extra long.

A) opposite of tinnie winnie short short dick!
Daaaamn Luke, your wanker was gibongous!
by dalethefarmer July 29, 2007
4 2