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1.
Verb.

1) The ensuing behavior following more than three shots of alcohol when one is both a lightweight and a small person named mitch, which includes, but is not limited to: refusal to go to bed quietly, making an ass of one's self, yelling "hey girl, take off that polka dot bikini," or any general act of combing both "bitching out" and being named mitch.

2) The act of bitching out, but when the person's name is Mitch.

3) The verb that describes mitch's behavior after three or more drinks
Person 1: Oh man did you see Mitch hiding under the table at the strip club?

Person 2: Oh yeah, he was totally Mitching out!

Person 1: Afterward he absolutely refused to pass out on the couch!

Person 2: Wow what a Mitch!
by Mingo_Fiercest December 15, 2009
 
2.
Verb. When a very straight girl (not a fence-sitter) succumbs to the charms of a lesbian who actively seeks to 'turn' straight girls, and enters a long term relationship with her. Term originated by a professor at Randolph-Macon Woman's College for such a relationship, based on the nickname of the straight girl involved.
Person 1: So, what's up with Katie and Megan?
Person 2: They're dating.
Person 1: Whoa, I didn't realize Megan swung that way!
Person 2: She doesn't really, she's totally Mitching out.
by Miss Macon February 12, 2006