Playing the xylophone 

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"

Playing the xylophone by Borthwick March 16, 2009

Playing the Purple Xylophone 

A slang term referring to using cocaine (specifically, snorting cocaine).

"Yeah I heard Jim got too caught up in playing the purple xylophone. It really ruined his life."
"My mom always told me to avoid playing the purple xylophone."

Playing the Purple Xylophone by anonymous March 29, 2022