A fork of Rural Dictionary
The maximum times a guy can masturbate in a given day.
My fap cap is 5.
When you're fapping, you reach your climax, but pull your foreskin over your dick so none of the cum comes out. Note: does not feel as good as normal fapping.
Bro, I was in art class today and I needed to rub my nub real bad so I fap capped.