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A person who has participated in anal sex so many times that their anus no longer closes back up afterwards, and therefore resembles a tunnel.
I don't know if I want to have anal sex anymore because I'm afraid of becoming a tunnel butt slut.
by Taryn June 04, 2004
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Dec 9 Word of the Day
The age at which one is finally considered human.
by Anonymous August 07, 2003
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