adj. The simultaneous feelings of disgust and contentment that a person feels after having been so hungry that said person stuffs his or herself so that they can barely breath without exploding.
I was so hungry during class, but after I went to Philbrook and ate everything in sight I felt wicked fat-nasty.
by something good February 10, 2005
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(n., pl.) The multitude of women that can be found on the Internet from either personal sites or chat rooms. These women can be easily detected by their obesity and sub-average physical attractiveness.
Yeah, I tried looking for a woman on those Internet personal sites, but all I came up with were a bunch of fucking fat-nasties.
by K-Von March 14, 2005
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An incredibly loud and disgusting fart. This title is reserved for the most foul, rotten-smelling farts.
I was in the elevator and some jackass cracked off a fat nasty.
by Beatsters March 15, 2010
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Person 1: OMG shes fucking fat
Person 2: What a fucking fat-nasty
by meh7845 August 30, 2006
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Also commonly used as "Fat Nast Ging" or "Fat Nast" (in short); it is a Ginger/Ging/someone with gingervitus that is overly over-weight, ugly as fuck, releases a deadly odour, has a morbit amount of freckles and pasty skin, or a combination of all these exaples. Fat Nasty Gingivitus is a rare deadly disease that happens to Gingers that wear flat billed hats with dollar signs on them, exco, fake chains, and exessivly smoke to be cool. They are normally extremely depressed and don't have many friends. Sometimes it is also brought on by excessive abuse from his/her parents.

CAUTION:
It is advised that if you come in contact with a fat nasty ging that you wash the areas that wer touched 10+ times with the highest grade of anti-fatnastging soap. If disease spreads, or stays for longer then 2 days, seak medical attetion immediately! FAT NASTY GINGERVITUS IS EXTREMELY CONTAGIOUS!
Harry: OMG that guy is so fat nast!
Donald: Stay away from him, you don't know what diseases it may be carrying!

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Teniqua: EWWWWW look at that Fat Nasty Ging!
TeSahwna: OMFG runnnnn!!!!

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Jelawnda: That fat ginger kid thinks he's so cool smoking. What a Fat Nasty Ging!
Lefawnda: He smells sooo bad too, hopefully I don't get the disease!
by cowboys87 February 8, 2008
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A rather large woman who is not a BBW, but rather a BFN.

Her lady lumps do not inspire any recollection of beautiful things like some chunky women might offer, but rather leave a sour taste in your mouth after you throw up a little.

BFN typically Photoshop their selfies in an attempt to justify their ugly lifestyle choices.
Dude 1: Hey man, did you just see that Big Fat Nasty?
Dude 2: What is that, a cheeseburger?
Dude 1: No man, it's thunder-thighs and butt cheese!
Dude 2: Gross.
by nguyeny-pants January 28, 2014
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