A phenomenon in which a man sits in a certain way that allows for his balls to droop down to his buttcrack, so the scrotum comes into contact with the edges of the anus.
Dude, my buttsack is so intense right now, that if I farted, my balls would blow up like a parachute.
by Thomasvaeth January 26, 2017
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A Wrinkly Ass That Looks Like A Nut Sack
Yeah she has a ButtSack Bro...
by idwer April 18, 2018
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(Buht-sahk)
An insult to others, often implying stupidity, craziness, forgetfulness and the lack of athleticism. Many people use it as a joke and call their friends Buttsacks when they forget something such as a homework. Buttsack can also be nice(if it is accompanied by an complement in the form of an adjective)
OMG! Bine! You are such a Buttsack!

By reading this you become an EPIC buttsack.

Buttsacks will rule the world by 2014.
by jeremia4263 June 6, 2011
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An instance where your nutsack is so loose you fold it into your asshole to keep it from going down your pant legs and when you shit it smacks you in the face,is very common in Asian women
by Luther420 January 8, 2019
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A buttsack is when you ballsack is dangerously close to your anal cavity, or butt, causing a mutation in between the butt and sack also known as buttsack (can be abbreviated for butsac or "bs".
Ew you smell like a buttsack

Brb gotta wash mah balls, smells like a buttsac all up in this bitch
by Dr. Thiccness August 24, 2018
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If it’s cold enough, a mans nutsack goes so far upwards it falls out of a mans anus
Oh my god man it’s sooooo cold out here imma grow a buttsack.
by Jason_Spaghetti January 8, 2021
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The combination of the nutsack, taint and butthole. Can be hit when kicking someone from behind.
"Open the door and kick him right in the buttsack" -Bruce
by Buttsack Lover October 21, 2011
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