Top definition
Means "Fuck yo bitch" The act of stealing a man's girlfriend/wife/person they're talking to and fucking, not neccessarily in that order.
"Damn did you heard what happened to Chris Green?"
-Dude 1

"Naw, what happened?"
-Dude 2

"Cam and T-Sqz FYB'd him with his top two females on his team."
-Dude 1

"Damn, haha."
Dude 2
by That Guy and his friend October 22, 2010
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May 3 Word of the Day
Internet persona(s) who happens to follow you and you happen to follow them back and maintain communication with and have a mutual liking for eachother whether it be friendship wise, etc. (Mutuals if more than one mutual)
Monica: Oh yay! I made a new mutual today because we started following & talking to eachother on twitter and we like eachother (so it seems).
by qtheresurrection March 25, 2015
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3
Fuck Yeah Bitch! An expression used when something is really exciting, or awesome.
"I'm so glad it's Friday, I'm going to get so drunk tonight"

"FYB!"
by mjs82 October 10, 2008
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5
"Uncuff ya chick brah, its FYB"

"Yo bitch is choosin, jez FYB!!"
by b r e e e e z y July 27, 2009
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6
Fill Your Boots - inviting someone to go ahead and do something
"Do you mind if I eat the last of the cake?"

"FYB, man."
by Ninjafingerofdoom February 24, 2013
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