Flat fatty 

A girl who despite being fat is also flat. E40 Fat flatty

See e40 over there? Flat fatty is shaken that ass.

Flat fatty by Goddamn Sugar Snap Peas July 18, 2016

big flat fatty 

A fat girl who is flat chested; a fat chick who does not have big tits. An overweight girl with small boobs.

See also big fat flatty.

That poor fat chick has small tits. She's a big flat fatty.

big flat fatty by PMax April 13, 2008