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3.
A PERSON WHO WORKS AT MCDONALD'S THAT WILL LIKELY STAY THERE FOR THEIR ENTIRE LIFE..
DUDE, THAT MCTARD FORGOT TO GIVE ME MY DOUBLE CHEESEBURGER.
by BIGSKINNY July 14, 2008
 
1.
Refers to the immeasurable number of complete asshats the world has to offer, as it is equal to the number of McDonald's restaurants in any given place.
Shane is such a McTard!
by Bean Breath April 05, 2006
 
2.
McTard is a shorter version of McRetard. A McTard is a disparaging term for a McDonalds, fast food employee or persons other bottom-level end position service related.

McTard is also a derogatory term referring to those with mental disabilities, mentally challenged and mentally handicapped persons working at McDonalds or food service related jobs.
That McTard couldn't get my order right, so the manager had to take my order!
by Anon-in-Illinois October 27, 2005
 
4.
A person who's greatly biased for MC and thinks he can beat just about anyone.
A typical MCTard: "MC can take out Ryu, Goku, Sephiroth, and God!! Because he's in one of the best shooters ever and he's cool like that!!"
by Kevin Justin August 03, 2006