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Girl who repeatedly shows up at your house, mainly after you have already gone to bed and wakes you up for sex.
Night slut: "Colin guess what I am?"
Colin: (was sleeping. . . recently awakened) "A night slut!"
Night slut: "YOUR MEAN!" (then gets naked and crawls into bed for sexy time.)
by Neg Burgerbowloff May 17, 2007
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