Flat butt 

A stroke played in Australian handball where the ball strikes the corner of the wall and the floor, making the ball roll back along the ground towards the opponent. Flat butts are almost impossible to return.

Great shot! What a flat butt!

Man, I'm in great form over summer. Hitting flat butts everywhere.

Mate, I'm in flat butt heaven!

Flat butt by AwesomenessXYZ February 7, 2010

Indian Flat Butt 

A condition that many Native Americans suffer from. The afflicted person has a very small butt. Note that both men and women can suffer from this.

Damn, I forgot that boys off the rez don't expect indian flat butt!

Damn it, my indian flat butt makes these jeans too loose!

Indian Flat Butt by NativeWoman January 21, 2011

Flat Asian Butt Syndrome 

Flat Asian Butt Syndrome (FABS), also known as Asian Booty Disease, is a benign medical condition that develops in over 95% of both males and females of Asian descent. The condition affects the entire gluteal region and is irreversible but not life-threatening. Symptoms include lack of volume and abnormal flatness. Typical complications are not being able to participate in popular dances such as twerking and not being able to fill out pants.

Sara: "I want to learn how to twerk."

Thomas: "With your pronounced case of Flat Asian Butt Syndrome, I think it would be a waste of time."

Flat Asian Butt Syndrome by Moroccanite June 23, 2023

flat bubble butt

Butt that bubbles, plateaus, then rounds again towards the legs.

An old lady who has sat for too many years on her bubble butt and begins to flatten but yet still round forming a flat bubble butt.

flat bubble butt by Downtoearthspace cadette April 11, 2017