A phrase used to describe large buttocks which are of course big and juicy, but not necessarily round or protruding very far after the initial curve of the back or 'shelf' on larger people
'Bro you can see that girl's ass from the front it's crazy'
'Yeah she's gorgeous, her cheeks are f(l)at af!'
'Fym f(l)at af- oh damn they're like double thick pancakes hahaha'
'Yeah she's gorgeous, her cheeks are f(l)at af!'
'Fym f(l)at af- oh damn they're like double thick pancakes hahaha'
by Squirtyduck January 31, 2024
Get the F(l)atmug. 
Military (USAF) Slang for Facebook. A parody of data links used to distribute information (i.e. TADL-J, TADL-A, etc.)
I'm glad you had fun in New Orleans, but I don't need your exploits at the strip club ending up on TADL-F.
by Air Boss June 8, 2011
Get the TADL-Fmug.