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Favorite Un-Biological Sister
OR
Favorite Un-Born Sister

A girl who you see as your own family even though you are not blood related.
We are not best friends, we are FUBS.
by malimalu248 December 11, 2009
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Apr 2 Word of the Day
Music so good it could elicit sexual arousal.
The new We Came As Romans albums is chock full of bonerjams.
by lpvitus October 28, 2009
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3
A F.U.B. is a Fat Ugly Bitch
"yoooo, your sister is a F.U.B."

-"What?"
"Your sis i a fat ugly bitch"
by Stokley Jones January 19, 2012
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5
Fat Ugly Bitch also Fucking Ugly Bitch

1) A woman who hit the trifecta by being an asshole,
ugly and overweight.

2) A woman who is both an asshole and
who is so fucking hideously ugly that
looking at her makes your eyes hurt.
Roseanne and Rosie O'Donnell are unattractive
fat women who are also known to be real assholes.
They're the inspiration to FUBs everywhere that they
too can be fat, ugly, act like bitches, treat guys
like crap and yet still get rich and famous...
Thanks for nothing you FUBs!

I wanted to poke my eyes out with a
sharp and hot object after seeing that
FUB staring out at me from my office
directory.
by Darclyte August 03, 2006
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6
A fub is the abbreviated term for fat ugly bitch
daniel: wow that girl is so big and ugly
John: yeah she's a real FUB
by Bustercherry#30 November 25, 2015
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