The involuntary action of manually manipulating one's genitals during REM sleep. This phenomenon is responsible for some unverifiable portion -- scientific estimates point to 5-10% -- of nocturnal emissions. It is rarely discussed in polite conversation, but is assuredly real. When caught in the act by an incidental third party observer, the awoken offender is often characterized by denial and defensiveness. The following sample text is a rare exception.
When I walk out of my bed full of pornstars and my head hurts from all the crack, I walk to my fridge and drink some award WINNING tiger blood, I realized I'm a sheenist
The act of Sleepsterbation is not under much debate. Although some believe it to be a myth, The truth behind the hidden art of Sleepsterbation lies in the cycle of sleep known as "rapid eye movement" (or REM.) While many can not control their physical movement while in this dream state, some "seasoned veteran's" are more adept at controling basic arm movements such as wiggles or sudden jerks. While not actually masterbating, the sudden jerks or wiggling of the arm causes the practitioner to become aroused and have a nocturnal emission.
Most consider it to be nothing more then a wet dream.
A play on the word "mainstream". Refers to various specific forms of media, primarily music, that cater to the mindless mass of people who lack the ability to judge different inputs as either good or bad.
Sheepishliam is a term, used to describe a distinguished canadian. Sheepishliam is very polite, once it comes to talk about masturbation, he disappears.