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When a man smacks his penis against a very skinny (must have ribcage showing) girl's ribcage.
Originates from the term xylophone for an anorexic girl.
"Dude, I played her xylophone last night"
"Im playing her xylophone later"
"May I play your xylophone?"
"I think with her I'd be playing the xylophone"
by Borthwick March 16, 2009
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