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

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

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

masturpooping 

It's when you poop while masturbating??!??

No more explination needed.

Toilet + Poop + penis + hand = masturpooping

masturpooping by Llamadude July 13, 2007

Masterbooking 

The action of masterbating to someone on your friends list on Facebook.

Man, I was masterbooking after I added the new girl from work.

Masterbooking by TheUNLiberator June 12, 2010