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1.
Pronoun. - Derogatory slur used for black people.

Not prevalent worldwide but was commonly used in 1970's New Zealand.
"Damn Mitters stole my bike."
by Refreshment Boxx April 03, 2010
 
2.
What men call male boobs big enough they can palm with a baseball mitt.
"That dude has a set of mitters"
by popologist November 22, 2012
 
3.
A mitter is a fan of a (usually badly) dubbed anime, that refuses to learn anything about the original show, or about the diffrences between the two.
Person 1: I love One Piece! Zolo rocks!
Person 2: Y'know, he was supposed to be called Zoro originally and loads of stuff was edited out of the dubbed version of One Piece.
Person1: Don't tell me about that stupid Japanese version, why watch something in a language you don't understand! The dub is fine - I bet it's even better than the stupid Japanese version!
Person 2: Gawd, you're such a mitter!
by GraceB February 20, 2006