When a guy eats a girl's brown button with his tongue and, simultaneously, fingers and squeezes her labia together like a bagpipe; a rusty trombone that is performed on women.
I gave my girlfriend a rottenbagpipe last night and she thought it was okay.
When a girl eats your asshole and squeezes your ball sack like a set of bagpipes. There are multiple methods including, but not limited to the reach around, the reach under, and the ever elusive two handed ball squeeze.
After she gave me a rustybagpipe,I wouldn't kiss her for a week.