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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
 
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