The penis and scrotum arranged in such a postion, it resembles a set of flesh-like bagpipes. The penis, of course, is the "blowpipe", and the scrotum, being the "bag".
Genetic mutations, which include multiple penii, and a huge scrotum, would also help to add to the effect.
Mostly played by women and men in kilts.
Mother: "JIMMY WHAT IS THAT NOISE?"
Son: "Nothing mom, just playing my flesh bagpipe."
Mike: "Greg sure does like to play the flesh bagpipe."
David: "At least he does something he's good at."