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31.
FB
1. Any two word expression with words beginning with F and B. For example: Fat Bastard, Fart Breather, Fiendish Buttsecks, etc.

2. The 1981-1985 Mazda (Savanna) RX-7, 1st Generation. Most people will confuse it for a Porsche, but it's a rotary powered banshee. Called an "FB" after its chassis code.

1. I spotted a couple FB's in the FB engaging in some serious FB.

2. What we thought was a weedwhacker turned out to be an FB outrunning some cops on the interstate.
by TSIBtF February 21, 2007
 
1.
FB
Fuck Buddy. A person who are having casual sex with on a regular basis, but are not involved in a romantic relationship with.
We aren't a couple, she's just my fb.
by Asher April 13, 2005
 
2.
fb
The shorthand term for Facebook.
Jojo has just taken a picture of Maddie

Maddie looks at the photo:

Maddie: OMG! FB! FB!
Jojo: Totally, i'll add it!
by La-Who? May 19, 2007
 
3.
fb
A common acronym for

1. "fucking bitch"; usually used as a curse/exclamation. Sometimes used as a hashtag by users on Twitter, www.twitter.com

2. Social networking site Facebook, www.facebook.com
Rob: "Ugh, it's raining..yet again. #fb"
Ted: "Stubbed my toe on the corner of my desk >:( #fb"

Rob: "Hey man, are you on fb? You should add me."
Ted: "Whoa, hey, did you see Rob's profile pic on fb?"
by aouttr May 05, 2010
 
4.
FB
1: Facebook
2: Fucking Bitch
3: Fuck Buddy
4: Finger Bang
1: Hey did you see Alex's profile on fb??
2: Who does that fb think she is?
3: That chick over there is my fb.
4: My husband fb me before we went to sleep.
by MehRoxz July 15, 2011
 
5.
FB
Short for Facebook.
"Come on man, you've been hittin' up that FB status all day."
by Mos before Bros April 16, 2007
 
6.
FB
What you type into google if you're too lazy to type the eight letters required to search "facebook".
Ugh, 8 letters is going to take forever...my hand hurts..." "Have no fear, type just 2 letters and you'll be socially networking in no time!" "Thank god for abbreviations! FB!
by blabby17 May 26, 2011
 
7.
Fb
Fb is short for many things I'm sure, but what it is most commonly known and used for is FaceBook.

Facebook is a homepage where one can share photos, status updates about their life etc.

Fb is not something one says while speaking, it is an internet chat or sms abbreviation.
"Omg, he totally wrote to me on Fb!"

"I uploaded all the photos from last night on Fb!"
by Mrs.Potatohead October 06, 2012