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Firing off the skin pistol 

1. To masturbate vigorously. Always associated with males.

2. To procrastinate.
1. ...Then suddenly he dropped his pants and immediately started firing off the ol' skin pistol. Fucking disgusting wanker.

2. Do you really think she is going to introduce you to her parents, or are you just firing off the skin pistol?

skin piston

A person that has sex in return for a Happy Meal.
She proposed the skin piston with a burger, fry, and a small drink.
skin piston by Ronbo1977 October 12, 2011

Skinpistol 

An Abercrombie hat wearing, date- raping, wanna-be frat boy. A pretty boy. A meathead. Any guy who is more concerned with his appearance than the average female, and who is overuses lame pick-up lines. Any guy who thinks he is hot shit, but is in fact a loser who can't get girls. A white preppy guy who runs his mouth to bigger, African American guys.
David is such a skinpistol! He started running his mouth to my bro!
Skinpistol by E-Bizzle January 25, 2004