A fork of Rural Dictionary
Where the man puts his penis in a girls armpit, whereupon she proceeds to lift her arm up and down, like she is playing the bagpipes. This act is known as Bag-piping.
"We had a nudy ceildhi last night and had a good ole time Bag-piping"
the act of thrusting someones armpit as if they were playing the bag pipes.
I totally bagpiped that McBroad the other day.