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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--adjective
1. To be able to take part in sexual activity following a period of time where one could not due to medical or personal issues.

2. To serve a purpose related to sex.
Following the birth of their son, Bill hoped his wife would be fucktional again sooner than she was for the birth of their daughter when he went four months without sex.
by quazy_quisp September 30, 2009
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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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Used to say that your sexual equipment package is still in working condition after receiving physical trama
Guy 1: Dude you just took a direct hit to your junk! Are you alright?

Guy 2: I think so, everything down there still seems fucktional, i better go see my girlfriend and make sure.
by CHe$+nu+ April 16, 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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