Butt tunnel 

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

Butt tunnel by Dangerously Dank August 12, 2018

Butt Tunnel 

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.

Butt Tunnel by Stagger14 April 25, 2011

tunnel butt slut

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.

tunnel butt slut by Taryn June 11, 2006

buttfunnel 

enormous cock

I let the whore suck on my buttfunnel

buttfunnel by verbalvomit2003 July 10, 2003