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1.
Something so big, it's more than enormous.
The Tsar Bomba had a giganormous mushroom cloud. It was the detonated October 30, 1961 and is still the largest bomb ever detonated on record, lucky humanity!
by ksadya May 11, 2007
 
2.
A mix between the words ginormous and gigantic!
Omfg her boobs are so giganormous!
by gawjusA July 31, 2009