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When your partner grasps your penis with one hand and vigorously strokes your banjo string on the underside of the penis up and down with two fingers until you bust a nut.

The banjo sting is medically known as the the frenulum.
Nothing makes me bust a nut faster than when Rachel strums the banjo.

I let the babysitter strum the banjo last night.
via giphy
by Tugg N. Harder February 06, 2018
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