Endless Toboggan

To performan the toboggan on an upward moving escalator.

In other words: To have sex in the doggy style position with the woman facing an up escalator. The man then knocks both of her arms out from under her, and proceeds to ride her endlessly down the stairs.

Girl1: So did you and boy 1 have sex?

Girl2: Yeah, my chest still hurts from the endless toboggan.

Girl1: What?

Girl2: Nevermind.