assmosis

the process of one's butt getting bigger just by standing beside those with bigger butts.
People with fat friends get bigger butts just by being around "fat asses"

Julie's butt got bigger every time she was near Jane because of assmosis.
I can't help that my ass has gotten bigger; it was assmosis.

by Serena Peterson January 6, 2009

Assmosis

It’s when a shit sits in a toilet bowl for too long and starts to dissolve and turn to shit water.

AJ: My fucking roommate left a shit in the bathroom this morning and I think it was clogged. I swear when I come back, it better not be there.
Isaiah: Nah, it’ll be shit water. What’s the term? Osmosis?
AJ: Assmosis

by MotherfuckingSatan August 27, 2019

Assissist

Someone who is extremely obsessed with ones own bootycheeks

John: Are you checking yourself out?

Stacy: No I'm checking my ass out

John: Wow you're a narcissist

Stacy: No I'm an assissist

by pussi hunt3r May 13, 2022

ASSMOSIS

/ˈæs·moʊ·sɪs/
colloquial; pathological hygiene myth

Definition:
The delusional belief that standing in shower water alone effectively cleans the human anus, negating the need for direct contact, soap, or scrubbing. Most commonly found in adult males raised in environments where touching one’s own ass is considered a gateway to eternal damnation or mild gay panic.

“Yo, I ain’t tryna go near my hole like that, bro. The water gets it.”
"Bro that's not hygiene...That's assmosis."

by Faceofadeadstar July 21, 2025