Constantly changing one's mind about whether or not to have sex, either in general or with a particular person.
Janice found Stanley attractive, but she also knew he was a transvestite, so she kept fucktuating whenever she thought of being open to him.
by anonkh August 13, 2008
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Inconsistency in one's sex life.
A: I used to get laid all the time, but I never do anymore...
B: I'm sure it'll be fine, life is always full of fucktuation.
by ultrahedgehog February 23, 2014
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When a stock fluctuates in the opposite direction you were expecting and you're like "fuck."
Man, i'm hella pissed, Apple is fucktuating hella hard today, I lost $8008!
by AnonymousHobo July 27, 2020
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A sexual (fucking) situation that you can't pass up for anything.
John: bro my mom's in the hospital I need a ride.

Kyle: Can't dude I'm in a fucktuation.
by aloejuice July 20, 2019
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The term fucktuation is an adjective used to describe a fucked/messed up sexual situation, including something unusual that occurred during sex or during a sexual act.
“I’m not sure what to do, I fucked my cousin last night.. and I kind of liked it, major fucktuation

“I have a bit of a fucktuation, my boyfriend really likes blumpkins but he eats so much red meat. It smells awful”
by Bizaboi April 01, 2018
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