OMS 

A large, marsh dwelling, amphibious bipedal creature. Can be spotted at dawn or dusk when it comes out to hunt its favoured prey, the cat.

In a sentence: don't go out at night or oms will get you

OMS by 4lbperchwannabe November 24, 2018

OMS 

Outta My Seat

This is an expression for something mighty hilarious.

“Bruh that shi had me OMS!” 🤣

OMS by Maria Kae May 4, 2019

OMS 

Oh my stars!

Samantha Stevens: "OMS! Aunt Clara that spell went awry!" Darrin: "SAMANTHAAAAAAA!"

OMS by lrachelw November 24, 2010

OMS 

Oh My Spock!
Spock is the Vulcan second in command on the USS Enterprise in the popular television show Star Trek: The Original Series, back in the 1960s.

Captain Kirk: Oh My Spock, that Orion Slave Girl is smokin'!
Bones: Agreed.
Scotty: Ay, OMS
Chekov: All thrusters full ahead!
Sulu: I like boys.
Spock: Silly Sulu, space is for real men! You are highly illogical.

OMS by Mrs. Spock March 10, 2010

OMS 

The shortened form of "old man in speedos"

used at public pools or beaches
usually combined with an involuntary shudder.

"OMS alert! run awaaaaaaay!"

OMS by shannanigans September 29, 2005

Oms 

Oh my satan. Meant for people who are on the highway to hell and are tired of "omg" and "oml"

Omg did you see the new iPhone that Apple released?
More like Oms, the prices will drive me to hell.

Oms by Fox :D December 26, 2017

OMS 

Oh My Scott.

An alternative to "Oh My God" or "OMG" for people who place their highest authority with Scott, not God.

Popular with atheists who have good taste in music.

Reference to Scott Weiland, lead singer of the bands Stone Temple Pilots and Velvet Revolver.

OMS, there are STP tickets on sale!!

OMS by Sydney47 September 26, 2008