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1.
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.
by silly_walk January 21, 2005
 
2.
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.
by Unsinkable Grace November 15, 2011
 
3.
OMC
Oh My Carlisle

Referring to the almost godlike compassion and restraint that the character Carlisle Cullen exhibits in the Twilight series by Stephenie Meyer.
Edward: Bella, just so you know... I payed Alice off to kidnap you this weekend so you don't get into any trouble!
Bella: OMC Edward, please say you're kidding!
by EpiceEmilie December 08, 2007
 
4.
OMC
Oh My Cher, instead of Oh My God (OMG). The phrase is popular in the gay community, whom stereotypically are obsessed with the famous singer Cher.
OMC, that is insane!
by Matthew Weyer August 08, 2005
 
5.
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!
by ClaireK February 02, 2014
 
6.
Old Man Crush. Having a crush on a sexy, older gentleman who may or may not be married.
O.M.G.! I have a serious O.M.C. on Sean Connery, yo!
by A.P. Ferrara February 21, 2009
 
7.
Well, its like OMG (Oh my God) But in this case. Oh My Cabbage.

Simple and less blasphemes :P
O.M.C that guy just took one to sack!!!

O.M.C check out the size of those....
by -Abe- December 05, 2008