When ones ball sack is so big that you can hit them from behind ones butt which cause temporary stinging pain.
When Jack bent over to retrieve his phone, Brook slapped his ass and unknowingly hit his butt nuts.
by Jax in the box May 13, 2011
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The Butt Nut Fart is an action preformed by 3 people. One must be the butt slapper, another is to be the nut puncher, and the last is to be the one getting hit. The 2 hitter must hit the person at the same time which in turn will cause a fart.
Tom: Hey, what are you guys doing?
Chris: You’ll see
Jeremy and Chris: BUTT NUT FART
*Smack* *punch*
Tom: *Farts*
by ckllol June 25, 2023
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When you ejaculate in a girls anus, have her fart it out, dilute with urine and have her drink it.
by Steve seagull July 9, 2022
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Sexual act involving at least 2 people, usually 3 or more, where one or more participants proceed to consume the male ejaculate out of the asshole of another counterpart which just had one or more men climax into
Guy 1: "Yo Bro, check that girl out! she looks so hungry!"

Guy 2: "did you mean to say thirsty??"

Guy 1: No man, she looks like she's ready for a huge 'butt nut buffet!'"
by Carotenuto May 24, 2018
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It is a universal word to describe your dissatisfaction, disapproval, or annoyance in someone or something.
"Your are not nice. You suck butt nuts."
"I don't want to work late, that suck's butt nuts"
"Mom is late again, that suck's butt nuts"
by The Us of We April 8, 2008
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