gigantuan 

Incredibly large; large beyond comprehension. Nothing can be larger than something that is gigantuan.

A mixture of gigantic and gargantuan.

If I could give you an example of something that is gigantuan it would be comprehensible, and thus not gigantuan.

gigantuan by ozmodiar August 24, 2004

Gigantitanic 

Something that is indded, very gigantic but has nothing to do with the titanic

Joe: I took my Gigantitanic balls so far up his ass he became a unicorn

Gigantitanic by Daniel De Ferrdo February 9, 2021

giganticans

A pair of unusually large breasts, usually reserved for those which are nicely shaped and on an attractive woman.

Pronunciation: gi-GAN-ti-cans. "Cans" should still rhyme with bans.

Can be abbreviated to "GCs" when there is a need to be discreet.

Las Vegas on a summer night is like a parade of giganticans.

giganticans by SLIPPAAA April 23, 2008

gigantaur 

Like humongous but astronomically bigger.

A portmanteau of 'gigantic' and 'minotaur.'

Skyrim user: Lydia, can you carry my GIGANTAUR burden?
Lydia: I can but I always die before any quest because I'm a useless NPC housecarl

gigantaur by pwubby April 12, 2019

GINGANTUA 

A Gingantua or a Ginga is a person who pretends to be part of the LGBT community, usually bisexual, for attention or selfish purposes.

"Youre not gay, stop being a gingantua Alfie!"

GINGANTUA by J.COWLEY November 5, 2019

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

Gigantisnatchalism 

1. The condition of having a naturally large or inflamed vagina.
2. To have a sagging, hanging, or floppy vagina.

That woman has Gigantisnatchalism.

Gigantisnatchalism by Scairen November 17, 2006