OMC

Stands for "old man cock"

Sometimes used to disguise actual meaning when the company around you would take offense to you saying "old man cock."

As in, you can't interact with a webcam (ie. on Chatroulette) without some old man cock popping up on the screen once in a while.

I like to start my day off with a bit of OMC.

You know who has the best OMC? Your dad.

by KCohen April 24, 2010

OMC

Oh my cock

OMC I can’t believe I failed my math test

by anonymous July 24, 2021

OMC!

Oh My Cron!
The exclamation of aghast fear when hearing of the new Covid-19 mutation. Combines Oh My God, Omicron, and Cronus the destructive, all-devouring Titan King of Greek Mythology.

"OMC!, another variant. Let's panic!"

by TwistedTiffany November 29, 2021

Omcs

On my cool shii 😎🤏🏼

Guy: “how you been?”

Other guy: “omcs mane”

by sadly.imbri January 3, 2020

OMC

Oh My COD
for Call of duty players it is a replacement for OMG

~"I am gonna go play some MW2"
-"OMC INVITE ME NOWW"

by ozbodozzy April 5, 2010

OMC

Oh My Cthulhu - a replacement for "Oh My God" (aka "omg") for those who prefer one (for whatever reason, including you're not religious or you're too religious to feel comfy using "god"). OMC evokes the great chaotic deity from Lovecraftian lore. Often used humorously.

Additional exclamation replacements include:
"Cthulhu's spawn!" instead of: "Jesus Christ!"
"Praise the Chaotic One" instead of: "Praise the Lord"

anyway you'd use omg
"OMC, what was that sound?"

by CuteyPatootey April 3, 2015

OMC

Basically a replacement for OMG, but instead of god at the end I thought a more iconic figure:Charizard.
The meaning is can range from surprise to 'that's just awesome'.

Everybody I just won the lottery, OMC!
OMC, that guy just jumped off a bridge!

by HippoPenguin October 4, 2010