When you wank your dick so hard that when you finally squirt your sperm everywhere your so tired that you decide to take a quick nap.
Make sure you clean yourself up before you take the nap or do it in a private area, otherwise someone may walk in and find you completely naked with a flaccid red dick and your stomach covered in sperm.
Mum: I think our son had a wetdream
Dad: Naaahh look how raw his dick his, he probably had a wild wank and was so tired afterwards he fell asleep.
Mum: Ahhhhh a Fap'n'Nap
Dad: Thats right
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.
Fap: the computer slang for the sound of a male masturbating
Nap: siesta, or small slumber usually occurs after time of great and strenuous activity...like masturbating.
When you add these two terms together, fap..and..nap, you get the term Fap-and-nap.
It is widely known that after intercourse the male component quickly goes to sleep after ejaculating all over his female lover. Therefore earning the name, "Fap-and-nap."