When a cat has a built in mustache.
This cat is a bu because they have a fine bu stache.
by Weinerdog17 April 12, 2021
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When someone is tickling your ballsack/nutsack with their moustache.
“Man my girl really gave me a stache sack the other day
by Stachesack May 31, 2020
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the art of pranking someone by drawing on the edge of a soda or beer can with a marker and giving it to someone, preferably a new coworker or intern
"Thanks for the soda" *takes a sip*

"HA!, now you have a starter-pack 'stache!"
by Ronald.j chanefeild August 19, 2022
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When someone has a sweaty upper lip and rudely drink from an apparatus that is intended for consumption by multiple people.
“Why couldn’t you waterfall the Arizona? You straight Sweat-Stached my drink…I don’t want it anymore. Keep it!”

He says he through with her but he’s probably at her house right now sweat-stach’n her snatch😂
by Brittany Krystine August 16, 2022
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When two gay males perform fellatio on each other in the "69" position and the top guy`s ball sac drapes down over the lower guys upper lip.
Man, I was giving Chad a mean blowjob last night in a hot 69 when he dropped a "sac stache" on me and I nearly smothered to death.
by IBleakin October 29, 2023
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