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1.
To jerk off or masturbate to photos on Facebook.
kid 1: Hey dude, wanna hang out later?

kid 2 (Extremely sexually agitated): Naw man, I'ma go fapbooking.
by phelgmcannon February 18, 2010
 
2.
The act of checking your Facebook in between porn videos.
Hold on, let me wash my hands. I didn't expect you to message me while I was fapbooking.

Jack was lucky when his mom walked in on him in between videos fapbooking.
by General Lee Derping May 09, 2011