(noun) Someone who is extremely stupid and forgetful.

Refers to ancient practice of attatching two mittens to a long string and then placing each through opposite sleeves on your coat so that when you remove the mittens you do not lose them.
Wife: "Happy anniversary honey!"

Husband: "Oh, that's right, today is our anniversary"

Wife: "Idiot mitten!"
by Master N May 3, 2006
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