Similar to fiction; Tale of sex that never actually happened.
Ummm...Remember when I said I fucked Becky and her mom simultaneously? That was actually fucktion.
by goatsearse May 11, 2009
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When you are doing Calculus function problems and obviously there's something else on the
mind.
Rick: "What the heck would f(x) equal? I hate fucktions!"
Esteban: "Hahahahaha... nice"
Ms. Rod: "What kind of problems are you guys doing?"
Evan: "That, my friends, is called a Freudian slip... haha."
by A Breed of Sushi January 25, 2009
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Erotica, erotic fiction.

Related to fanfucktion.
They're claiming that her new book goes under the Romance genre, but it's really just plain, simple Fucktion. There's no emotional connection between the protagonist and her partner.
by Gale Gynoid April 27, 2010
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A function that's totally fucking your maths.
(In reference to a page of mathematical derivations)
This is impossible! This fucktion is ruining my shit!
by PhysicsProcrastibator October 26, 2010
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the heat generated by having sex
Gosh, it was cold in here a few minutes ago, but it's warm now--must be the fucktion
by Mike Reilly October 17, 2003
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fucking fiction, as in fiction that is so awesome that an expletive must precede it, or fiction that fucking rules, see also: George Saunders.
"Aw dog, I don't read. Shit puts me to sleep."
"Clearly, you haven't encountered any FUCKTION. And I happen to have a copy of Arthur Bradford's Dogwalker right here."
"Never heard of him. Are you going to finish that frankfurter?"
by hiddenballroom March 20, 2010
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having or serving a sexual purpose; capable of serving the purpose of sex and for which it was designed: fucktional architecture; a chair that is fucktional as well as decorative
The way the kitchen is designed allows the chefs island great fucktionality.
by Scub snubs November 7, 2013
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