Masturbating while at great risk of being discovered. Usually this involves being in close quarters with family members, people of the opposite sex, or anyone who would generally be upset when finding out. It is often evidence of social prowess to have completed the act and is frequently boasted about with friends later. The more dangerous the situation, the more street cred you get.

A casual invitation / threat used by an individual that is not afraid of fucking someone up.

Shouting "MAW" then whipping it out. Toying with it until finale. Wet Mess.