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Fb is an acronym used on social media sites such as instagram meaning " Follow Back".
*follows Kim on ig and comments on a pic*
"Fb?"
by Xmariah6 February 04, 2015
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2
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
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3
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
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4
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
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5
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
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6
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 Raskihottie11 May 26, 2011
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7
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
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