The act - either planned or unplanned - of falling to sleep after masturbating.

A stupid person; it refers to the lack of surface area on an individual's brain. The general thought is that the more surface area (wrinkles, creases, etc.) a brain has, the smarter the person is. Conversely, a person with a smooth brain (no wrinkles) has less surface area and would therefore be stupid.

Where somebody goes and masturbates, then quickly falls asleep.

When you masturbate and the climax is forceful enough to knock one into slumber.

Invented by Jeremy from Boise.

When a male/female masturbates before bed, in an attempt to fall asleep during orgasm. Masturbation + Nap= Maternap