A variant on the word "fluctuation", commonly used in the world of economics to identify irregular/varying market movements. However, this term is used specifically in reference to sexual targets of one's liking. In other words, "fucktuation," defines the irregular change in taste of men and/or women when put into a sexual connotation.
1) "Yea, seems like Clinton has taken a liking towards younger girls now."
"I dunno man...he used to date older women, maybe he's going through a fucktuation."

2) "Yo bro, should I go for the younger or older chick tonight? I can't decide dude..."
" Make up your fucking mind and stop fucking fucktuating."
by Andrew Lui May 22, 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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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 May 19, 2018
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