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A person, usually of the opposite sex, who barely meets your fuck standards.
Malcolm: "Tina's ass is dive-worthy but her face pisses me off!"

Jebediah: "Yeah man, she's definitely a flat fuck and nothing more."
Flat Fuck by Ohaooa May 3, 2008
Basically when a woman has a chest flatter than any men’s chest so you have to call them a flat fuck because of it.
Milton: Dude, Kris has a chest flatter than paper.
Jasmine: So she’s a flat fuck!

Flat Fuck Friday 

the day with a flat fucking gator as the mascot, and the day after Out of Touch Thursday.
Person: "IT'S FLAT FUCK FRIDAY YOU FUCKING LOSERS"
Flat Fuck Friday by Wyatt9017 September 25, 2020

Flat fucks 

A fun and playful way to say pancakes to strangers.
Ay bro pass me the flat fucks and the maple syrup please I don't want the fat fucks.

mother fuckin' titty suckin' two ball bitch with flat granny boobs, face full of testicles, a ping pong pussy and a 2 inch crooked rubber dick with no balls or hair 

a long fuckin burn that schools the shit out of any dis you get.
Bully: "Hey gimme some money lil bitch."

little bitch: "No u give ME some money ya mother fuckin' titty suckin' two ball bitch with flat granny boobs, face full of testicles, a ping pong pussy and a 2 inch crooked rubber dick with no balls or hair."

mother fuckin' titty suckin' two ball bitch with flat granny boobs, face full of testicles, a ping pong pussy and a 2 inch crooked rubber dick with no balls or hair:
"Shut up. JUST SHUT UP. (runs away crying)"

Fucked Flat 

The State of being Fucked so many times and having so many orgasms (etc) that dehydration may ensue to the point of Death if it continues caused by repeated and non stop orgasms!
I was so fucked flat in that Group Sex orgy and with the 8 guys who fucked me over and over in that Gangbang, that I may have to go to the Hospital for dehydration and get fluids through an IV or I shall die for sure! What a wonderful night/day/weekend with all the orgasms I had with so so many, many people who would not stop.

Did I mention is could cause me death through too much pleasure for sure?
Fucked Flat by kinky-doll April 2, 2010