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A fat ass nut is when you blow your load so hard it could fill a whole room and still have some left to rub on your face.
I had a fat ass nut during my lunch break and my coworker asked if I was having a seizure.
He said he had a fat ass nut so loud the neighbor called the cops.
I had a fat ass nut in the car and my dog started barking at me like I was a monster.