Masturbooping 

Jerking while pooping on the toilet.

man i was so bored sitting on the toilet, so i started masturbooping

Masturbooping by ZomgPoof December 12, 2011

masturboxing 

A man who beatboxes while masturbating.

I was sitting in the bus the other day when I heard a guy behind me beatbox, so I turned around and saw that he also was masturbating. I was like... "WTF, MASTURBOXING?"

masturboxing by Sarahreen September 30, 2009

Masturbowling 

The act of smoking marijuana by one's self, esp. after failing to locate a partner to smoke with you.

"Annie and Jane said they wanted to blaze with me, but they left with Tom so now I'm stuck masturbowling."

You: "You wanna go get some food?"
Me: "Give me ten minutes, I'm trying to masturbowl in here."
You: "......whatever you do, please wash your hands."

Masturbowling by tightnbright October 22, 2011

masterbooping 

When you take a dump and jerk off at the same time.

"damn, that brey chick is hot. But i gotta take a shit. I'm gonna go masteboop.

"mark's mom caught him masterbooping. He was covered in feces and semen."

masterbooping by cuminmybutt January 12, 2008

masterooping 

masturbating while you take a poop.

one day i was sitting on the toilet masterooping.

masterooping by chief121692 November 18, 2010

Masterbooking 

Hitting the "like" button on your own Facebook status.

Have you noticed how William always "likes" his own status? It's like he's masterbooking or something.

Masterbooking by lrchtr December 7, 2009

masterpooping 

masterpooping is when you take a shit in your hand and then masterbate with said shit

I have nothing to do, I guess I will just spend the day in the bathroom masterpooping

masterpooping by onlycass August 5, 2010