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A large/ugly female, that one picks up at a bar and sleeps with, after the dissaproval of friends. The morning after you wish you could have a redo of the night before sort of like using a mulligan after a bad golf shot.
Roomate 1: What did you do last night?
Roomate 2: Dont ask... I am using a millergan!!!
Roomate 1: Do you even remember her name?
Roomate 2: I think that millergans name was Darcy
by GWiggins November 06, 2007
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