pre-fap

pre-fap is an unfinished masturbation session to get ready for intercourse

Oh, you want to have sex?
Let me just do a quick pre-fap, I don't want you to see it soft.

pre-nap fap

1. A scenario in which one lies down for a nice power nap, but due to an inconvenient erection or horny thoughts, must jerk the gherkin before drifting into a long, restful slumber
2. A masturbation session completed right before a nap, ideally an afternoon nap. This fap sesh is intended to release tension, relax the masturbator, and prepare him for a long, restful nap.

3. Any other sort of fap that comes before a nap

(Matt) : Dude, you look so well-rested, what's your secret?
(Kai) : I hit that pre-nap fap bro, I feel totally restored. I'm a new man.