The term used when two people of any sex create a tunnel by pressing their bare bum cheeks together, usually for the purpose of a third male party to insert their penis for sexual pleasure.
“Ryan rang at lunchtime to invite Mike and i round tonight for a bum tunnel and a curry”
George “Would you like my wife and I to bum tunnel you?
Bum club is a club consisting of 4 people, mostly males, who show their bums (or other parts) for fun. Meeting usually take place when members are alone at night.
Triffelin hoe who doesn't care who's dick, how many dicks, or where those dicks have been. Her only goal is a dick in the face. And enjoys keeping those rewards for as long as possible by not brushing, flossing, or rinsing. Then proceeds to engage in as much group contact and conversation as possible so she can brag by exuding her bum Dick Breath on all. All of which she does while exclaiming she's not that kind of girl.
Jesus Christ can you believe that bitches bum Dick Breath. Seriously she should go talk to a wall or get into a fight with a toothbrush. What a foul ass hoe.