The kind of fat that is on a girl around her mid waist which makes her not skinny but not fat. Its the kinda fat you want to fuck. Used like in the phrase "more cushion for the pushin' " without the girl being incredibly fat or unsexy

Also called FF for Fuck Fat.
Dan: you man, i want a girl, but all the hoes 'round here are all anerexic fuckers.

Zack: Dude, what 'bout Ellena?

Dan: Isn't she kinda heavy?

Zack: Naw man, i tapped that last week. Its All Sex Fat.

Dan: gotta love the FF.
by SecretJustin February 5, 2008
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The sex of fat between fatty sex with the sack fat sach fat sack.
God yes gimme that sex fat mommy.
by Rico silly September 10, 2021
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to have sexual intercourse with a heavy set (large) person.
"Billy Bob, why did you have sexual intercourse with her?"

"coz its fun to fuck squishy... you know, fat sex"
by ihkol August 19, 2008
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1. Intercourse between a normal person and a very very fat man.

2. Both people are very very overweight...trying to have sex.

3. A skinny man attempting to have sex with a very large woman.
ie. Haley is going to have fat sex tonight.

"He tryed to have sex last night."
"Sex?"
"Oh I meant FAT SEX."
by The REDhead<3 April 18, 2009
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