floppy fuck 

Having sex with a flaccid penis; also as a noun, an aquaintance who's fetish is going in soft.

"Alex is such a floppy fuck!"

floppy fuck by Jacked unicorn April 20, 2017

flappy fuck 

When doing cosplay during sex and the significant other is dressed up like a sweet little flappy bird.

Flappy fuck is 1000x more addictive than flappy bird.

flappy fuck by Bad C dev March 4, 2021

Flappy gum ass mother fucker 

When someone talks so much everything that they talk is shit and they fuck their mother

“Hey bob” “yea” “shut your flappy gum ass mother fucker up”

Flappy gum ass mother fucker by Ferelliekos September 23, 2020