f.f.y.a.
f. f. y. a. is when you ram your fingers up someone's butt like it's a race and you're trying to win.
I did f. f. y. a. to my dad and he said I was faster than his car.
My brother did f. f. y. a. to my mom and she told him to stop or she’d take his phone.
At school, my friend did f. f. y. a. to his teacher and the whole class laughed.