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8.
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 November 28, 2007
0 38
 
9.
When two people engage in anal sex.

(called "assmosis" because the two lovers are absorbing each other's pleasure as they bump their ends)

Derived from the word "osmosis."
Okay cowboy, let's go make love on the couch via assmosis.
by Mark H May 22, 2004
6 45
 
10.
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 October 02, 2007
3 43