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1.
A large amount of semen, ejaculate
That bitch was so hot I busted a Fat Nut on her tits!!!
von DoctorVegas 30. November 2009
 
2.
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!"
von Darren Hunt 5. Januar 2007
 
3.
A Fat ass person that is very poor and gay.
Oh my fucking god look at the fatnut being teabaged and smileing!
von Leo U 6. November 2006