Top Definition
n. 20th century. A lesbian. Alludes to what is presumed the way lesbians have sex: the rubbing up against each other.
by super love May 29, 2003
1 more definition
5 Words related to flat fuck
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."
by Ohaooa April 30, 2008

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