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.
(fuck-shoo-ate) v. to have multiple sexual repeat partners; to fluctuate between fuck buddies; a conjunction of "fuck" and "fluctuate."
A: Have you met, Erin, the new girl?
B: Yeah... She likes to fucktuate between the football and lacrosse team.
A: Seriously?! What a slut!
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.
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.
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”
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!