gigantumous 

Extremely large....bigger than gigantuin...the largest form of BIG possible

"Oh Brady, compared to Hank, Your penis is GIGANTUMOUS!"

gigantumous by ...Brady... April 5, 2005

Gigantalous 

Commonly used to describe a female with a huge posterior. However can also mean big.

That A*** is gigantalous.

Gigantalous by TayoThatGuy August 9, 2019

giganormous 

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!

giganormous by ksadya May 27, 2007

gigantalous 

big bum

if you saw her bum it was scandalous got me making up new words gigantalous

gigantalous by DRAKE AND ADONIS6666 August 9, 2019

gigantous 

a cross between gigantic and enormous. fricken HUGE!!

wow, your house is one gigantous mofo!

gigantous by ze_kimster January 15, 2005

gigantuous 

Of exceedingly large size.

That girl's booty is gigantuous!

gigantuous by baachou October 12, 2008

Giganormous 

A mix between the words ginormous and gigantic!

Omfg her boobs are so giganormous!

Giganormous by gawjusA July 31, 2009