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The opposite to the gentlemans skin flute(penis)...

A womans tuppence (vagina)
Buddy 1: that chick last night was crazy, she knew how to play a great skin flute and I only lasted a couple of bars of the music sheet before I was done

Buddy 2: did you reciprocate and play her beef harmonica till her shoes were sodding?
by The Count Of Monte Rizla July 22, 2013