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The act of a man and woman having sex tied to a chair placed at the top of a staircase, and after climax, tipping themselves down the stairs. Often referred to as "buying" a non-refundable bus ticket.
John: "Hey man, how did you get that scar on your leg?"
Paul: "My girlfriend and I decided to try buying a non-refundable bus ticket."
John: "Ouch, dude."
by CRACKHEAD42 February 20, 2011