A whore that works the homeless in underpasses and subway tunnels. Made famous by the band INSEX.
She is the best tunnel slut a homeless man could ever ask for.
by Daddy Drake September 17, 2007
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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 4, 2004
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