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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A word you'd use to describe a fictional character you'd be willing to have sex with.
by GyroGearloose January 8, 2018
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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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The suction created in the vaginal or anal region during intercourse. This physical phenomenon will not occur with small cocks. It, in fact, takes a considerably large one (typically) to accomplish this feat. Other items can be used to accomplish this doe.
Jenny-"So, how was Paul last night?"
Laney-"He was fine."
Jenny-"Was he big enough for any fucktion?"

Laney-"Please, he wasn't nearly big enough... fortunately he has other ASSets that compensate for his small ass dick."

Jenny-"Damn, it's hard to find someone big enough for that doe"
by dav-o March 18, 2014
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When you have a REALLY fucked up mind and extremely dark sense of humor, but can still function like a normal human being when around other people.
"Dude, we're so fucked up"
"Yeah, but at least we're fucktional"
by niBBa nicc September 26, 2019
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To have a mind full of fuck.
mish: you're brain can't even fucktion right now
by Kinnipop January 22, 2011
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