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(n.) a staircase that spirals round, with turning steps.

Idiom to describe a situation where the next step is not always clear, and a large amount of training in doing this is required.
This project has become something of a spiral staircase.
by Kung-Fu Jesus May 05, 2004
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Is a sexual position in which the male enters the female from behind, pushes her face into the pillow and then sticks his thumb into her ass and twists in a clockwise motion. This gives the sensation of the downward forcing motion during thrusts from the pelvis.
Hey man, I took this girl home lastnight and gave her the spiral staircase!
by Gino Genoa March 31, 2010
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