The act of two butt holes converging to make a tunnel
Those two girls are scissoring with their assholes!

Haha they made a butt tunnel
by Dangerously Dank August 12, 2018
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What becomes of an underclassmen when an upperclassmen takes an act or statement of an underclassmen and makes them severely regret it. In essence, the underclassmen was raped by the upperclassmen and has to walk around sporting their new butt tunnel until the swelling goes down.
If an underclassmen challenges an upperclassmen to anything and then looses his ass becomes a butt tunnel due to the rape he just endured.
by Stagger14 April 7, 2011
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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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