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3.
UMC
United Model Congress

The greatest club that ever lived.
Master debaters that congregate for several weekends a year to hangout, have coed sleepovers, and DEBATE!
I love Model Congress
Yea me too man, imma be so sad when Im a senior and I have to say goodbye to UMC!
by A UMC delegate May 02, 2010
 
1.
UMC
Unintended Mexican Children. Children of Mexican families that are obviously not wanted.
Lets go to Ross. No it is like a third world county just full of UMCs.
by tacosauce1 August 18, 2011
 
2.
UMC
U Mad Corny (you're mad corny) the person you refer this to is silly, tried to tell a joke that failed, purposely does something to aggravate or please someone or purposely does something he/she knows will get a negative response.
girl: i miss you

boy: I miss you like a bee miss the flowers

girl: lol umc

ex2:
guy: dude you going partying later on?
guy2: nah ima play my new video game tonight

guy: umc
by jorise25 February 12, 2012
 
4.
UMC
Stands for Under Major Construction.
Rob: Hey, how's your house going?
Tom: UMC, man.
Rob: What?
Tom: Under Major Construction.
by Twiddles. July 01, 2009