Top definition
When you use pictures of women in bikinis on Facebook in order to masurbate. Often times done at work where the porn sites are blocked.
Guy 1:Hey, I'm gonna go Mastur-book in the bathroom.

Guy 2: To who?

Guy 1: Lisa. She just added some super hot Panama City pics.
by yamitl April 24, 2011
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Aug 1 Word of the Day
the act of texting people while you are pooping
ex. (talking to a friend on fbook chat)

person 1: hey man whats going on tonight
person 2: i gotta go to the bathroom il poopt you

or

person 1: whatsup man what are you doing?
person 2: poopting you
by mr.poopter January 26, 2011
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2
When you close your eyes and randomly hit a letter into your facebook search bar and jerk off to the first decent girl on the results.
*Thinking to self*
I don't know who to jerk off to... I'll just masturbook
by BlahBlahxx54 August 04, 2011
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