Used when "facebook" seems to take ages to do stuff, like chatting or uploading photos etc
I couldnt chat on fuckbook last night, it was going too slow.

I tried to load up all my holiday photos, but fuckbook was messing me about.
by Peters a star May 1, 2009
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Any book or magazine that contains erotically stimulating material.
Joey was looking at his favorite fuckbook, a photo album, jerking off to photos of his girlfriends, and he roped all over the place in no time!
by pentozali May 10, 2009
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A term used on facebook when you are having cyber sex with another person over facebook
cassie: grace was fuckbooking when we were supposed to be getting our project done
molli: that little bitch
by whos that girl? June 1, 2009
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the act of sexting through facebook messages.
"Oh was johnny fuckbooking again today? i told him sexting was classier."
by fuckbooker November 20, 2011
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An alternate name for Facebook when a slutty female decides to take trashy/clothless pictures in order to get 30+ likes. These unfortunate attention whores are usually bashed because of their trashy actions due to mental issues, attention seeking problems, and/or they were molested or raped as a child or fantasize about it. These type of people ruin Facebook. These type of people deserve no respect. Total scum -____-
Example 1: A girl who decides to put on a bikini and take pictures of her bare body to seek the wrong kind of attention.

Example 2: A girl who poses in a slutty/trashy way, almost like a porn star or worse.

ETC.

Dialogue...

*Alex browses through Facebook and spots a picture of a girl who is 99% naked*

Alex: Wtf? Dude, this chick needs to put some clothes on. This is Facebook, not Fuckbook. If I wanted to see porn, I'd go to Spankwire!
by MrStud May 23, 2011
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The act of being on facebook while fucking.
Ah shit man, I was talking to this girl I like and it turns out she was "fuckbooking."

Bet you wish you were on the better behind of that one!
by WiseWordsFromLemons March 1, 2011
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A Facebook-Inspired website designed for online sex
I hope you have a fuckbook account cause’ they’re lot of pretty girls out there
by Fortnite1500 April 19, 2019
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