a "big" ass, often used for people who have very small asses.
person 1: GYATTT!!
person 2: they have no ass, what chu on ab?
Term used for a large or fat ass.
Used by the W or L Twitch community whenever they see a fat ass.
Adam: Look at that aunty's GYATT bro, its fat.
Brent: Please shut the fuck up
The noise i make when i see your FUCKING MOTHER!
I see a small child "GYATTTTTTTT"