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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 

Master bating to somes picture on facebook.
I dont do this. Masterbooking
Masterbooking by The One Kid September 12, 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

Masturbooping 

man i was so bored sitting on the toilet, so i started masturbooping
Masturbooping by ZomgPoof December 12, 2011

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