OMC 

OMC is the sacred dialogue of the cherished Church of Chrolloism.
Chrolloism is a religion of incredible depth, followed by dedicated Chrolloists. We do not have a god. In Chrolloism, we honor our Lord and savior Chrollo, who is so incredibly talented that he is also the head of the Phantom Troupe. Chrollo is worshiped by all of his beloved Chrolloists as a hot ass motherfucker🙏 and we say OMC instead of OMG to honor our lord and savior.

Person 1: Look at that hot dude!
Person 2: Oh my Chrollo, no he's not. He looks like Tonpa.
Person 1: Omc, no he does not.
Person 2: Your right, he looks more like Netero.

OMC by ScrunchieWaterBottle February 25, 2022

OMC 

"Oh My Chuck"

Used by fans of the show "Supernatural" as an alternative way of saying "Oh My God" since Chuck the prophet is actually God.

A: Do you like my new shirt?

B: OMC, I love it!

OMC by ClaireK February 2, 2014

OMC 

Original Male Character
Used in fanfiction when an original character is inserted into an already existing set of characters/fandom. Often shunned due to fear of Gary Stus, hence it is given as a warning.
See also: OFC

Pairing: Buffy/OMC
I'm terrified to use my OMC because some might think of him as a Gary Stu.

OMC by silly_walk January 21, 2005

omc 

"Oh My Cas"

Play on "Oh my God". Fans of the hit CW TV show, Supernatural, have come up with this term after the Season 6 Finale when a character (Castiel) proclaims himself as God.

Girl1: Did you see that Tumblr post?
Girl2: OMC, it was gorgeous.

omc by Unsinkable Grace November 20, 2011

OMC 

Short for COVID-19 variant Omicron

OMC is spreading like wildfire across the US and the rest of the world. It's now the dominant COVID-19 variant.

OMC by Nas Nasir December 21, 2021

OMC 

On my cousin

“bro stop lying..” “g I’m not lying bro I put that omc”

OMC by mrbagabetch June 9, 2022

OMC 

oh my communism --> used instead of God as religion is not okay in the communist utopia. Idiy rabotay suka now.

OMC they really seized the means of production!

OMC Vlad managed to finally destroy the bourgeoisie today!

OMC Stalin is so fit.

OMC by LeninIsMyHusband May 13, 2018