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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
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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