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1.)n. The trap door or pit in a theatrical space. Typically used to house the orchestra.

2.)n. The fold of skin connecting the balls and the shaft of the penis.
My underdshaft has some floral smegma around it.

Sometimes it's fun to get a hummer in the undershaft of a theatre. Most people find it fun to get a hummer anywhere. I like the undershaft.
by Major Barbara February 15, 2010