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Multiple Orgasm Syndrome -

An ever-looming threat that hangs around the corner for all of us. Happens whenever we see someone wearing a comically sexy outfit such as jorts or socks and sandals. Results in a lot of cumming and moaning and is uncontrollable.
"Bro you shouldn't wear those jorts you don't wanna give the ladies M.O.S."
M.O.S by ahahano October 12, 2019
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millennial outrage syndrome (MOS): the constant need to find outrage in everything all the time.
Jeff has a raging case of M.O.S.
M.O.S by E Towne August 31, 2019
Some one who is not related to you but is older mentally and is close enough to be your sister.
Sarah is My M.O.S
M.O.S by Savage16 May 30, 2016
Stands for "Manual Orifice Sex". Describes when a man manually cuts a hole in someone and sticks his cock into the hole. This is the fastest way to get HIV.
Guy 1: "Hey dude, did you here about the one guy who killed that girl by M.O.S?"
Guy 2: "No dude I didn't, that is sick."
Guy 1: "Yah well at least he got HIV."
Lara is M.O.S, she hasn't answered in 30 minutes.
M.O.S by Kota422 May 13, 2020
Multiple Orgasms

Used like one would use xoxo (hugs and kisses) at the close of message..

Promising to give pleasure
Miss you babe...
m's & o's ;)
M' & O's
M' & O's by Tattooed13 December 29, 2016
Member of Opposite Sex.
I have engaged in foreplay with an M.O.S.
M.O.S. by Dash_Morlock July 21, 2010