smacking pen 

beating off (also pen smacking)

I rented some porn and started smacking pen.

smacking pen by Sean April 10, 2004

pen smacking 

mausterbating (also smacking pen)

I found some porn and starting pen smacking.

pen smacking by Sean March 7, 2004

Penis smacking

Penis smacking is the art of repeatedly hitting your own penis with your, or anothers hand for pleasure. You can also use objects such as wood, spoons, whips, and maces.

Bill: My penis hurts. Andy: Why? Bill: That stupid bitch Kate started Penis Smacking me the other night with a whip!

Penis smacking by Chase11 June 26, 2009

penis stacking

the act of stacking multiple penises on top of each other inside a vagina

Is it time for another penis stacking Mrs. Whashington?

penis stacking by Logan Howell, Sam Bilyeu May 9, 2008