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When the the back of your hair is flat from the result of laying flat down on your back.
Look, that nigga got flatback.
Flatback by Bdog1438 June 15, 2020

flatfaced 

In a way - stupid person. BUT in other way - a genius with brillant ideas for overwhelming the world by conspirative music with secret messages. Also a good supporter of the REMURDER crew.
That flatfaced guy is such a moron. I hate him. Actually I pretend not talking to him.
flatfaced by remurderer July 30, 2008

Flapjacked 

A variation on a pwn created at tl/fwi forum which constitutes the ownage or pwn of a poster who has been gotten to
That wasnt just pwnage, he's been flapjacked!
Flapjacked by =ID= July 8, 2009
Someone who has a flatback as a result of laying on their back too much. Who are of a promiscious nature. Or simply, a female who is a sloppy, loose, trollup.
"man, that Deanna, she is such a flat back, I have seen her with 3 different guys this week!"

or

"Wow, why is he dating that flatback whore?"
Flatback by Elphaba. W. Witch August 5, 2008

flatbacker 

Someone who fucks their way to the top. On their flat back!
That whore is so stupid. There's no way she got her high paying position because of her brains. She is just a flatbacker.
flatbacker by Dogofalljones May 16, 2017

Flapjacked 

The act of putting ones pussy lips on anothers forehead
Man she got so loose that she flapjacked me.
Flapjacked by DamioNIN October 21, 2013