A large amount of flesh and fat around the male pelvic region. It occurs to obese men and is more pronounced when tight fitting trousers or sweats are worn.
Those tight fitting pants Bill is wearing really highlights his Nut Fat. It looks like he's trying to smuggle a bosa ball in his pants.
by Happy Boy December 09, 2009
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A large amount of semen, ejaculate
That bitch was so hot I busted a Fat Nut on her tits!!!
by DoctorVegas November 30, 2009
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The roll of fat that extremely over weight women have that hangs below their waist. (Not to be confused with phat nutz.)
"Damn dude, Misty has really put on weight since high school!"

"Yeah, I know, she has fat nuts!"
by Darren Hunt January 05, 2007
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someone with a large head. scots insult.
"fuck up, ya fat nutted, bawheedit bastard."
by conor147cfc March 08, 2017
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When you masturbstate for straight 6 rounds after an extended period of abstinence due to circumstantial inconveniences.
End of the summer camp:
Jim: ‘Ye when I’m back home imma bust a fat nut
Jack: ‘nice’
by 'Filthy Mortal Child' July 13, 2019
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When you release a nut of gargantuan proportions that is worthy of the gods
"Wow i busted the mightiest of fat nuts in my neighbors dog yesterday"
by ForJevers December 13, 2016
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