Many Different defintions, but they pretty much mean all the same thing:

Fat Ass Bitch
Fuck A Bitch
Fat Annoying Bitch
Fat Asswipe of a Bitch

Can also be used as a slang term for "fabulouse"
by Caroline Manuel May 26, 2007
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Short for the measurement of fabians, relates to the level of homosexuality. 1 being slightly gay 10 being really really gay. There is no limit to the level of fabians one can be but anyone over 10 is very rare and must be approached with caution

Pronunciation: Fāb
Wow, you're like 3 fab, you should really stop blowing dudes.

Did you see that guy, he is at least 6 fab, loves dicks in and around his butt.
by Sunday Monkey August 12, 2008
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FAB: short for fat ass bitch, can be used towards teenage girls without them knowing they are being insultin. Latin root: Fabicanisus, the goddess of fried foods
She is such FAB, she shut down the all you can eat buffet within a few minutes.
by Austin Forty Duece March 1, 2008
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One of many words a straight man should never use.
-That's so fab.
-*cough* fagget...
by yay kno April 15, 2006
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When a motherfucker is soo fabulous that they don't need the rest of the word and only use fab. It is only used for the most fab people
Person1) damn that person is fab

Person2) that person is not fab. XxMikasaSwaggermanxX is fab
by CptLeviSwaggerman February 25, 2015
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Something that is so expensive or fancy yet utterly useless; overkill; something that says you got money to burn; very materialistic
$100,000 bed w/ 24K gold bed frame and block and ultra-fine silk linens. (What does this bed offer that a simple 1000 dollar bed does not besides luxury?)
by anonymous December 23, 2004
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A place were Intel Processors are made. Similar to hell.
I work in a fab for my job.
by Intel Hater July 8, 2006
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