Where is the saying "Paddle faster, I hear banjos" from?

Question

I've heard this a few times now and I have no idea where this comes from....

Answer 1

In the movie "Deliverance" (starring Burt Reynolds) the main characters are tortured by some scary hillbillies while on a rafting trip.

The song "Dueling Banjos" is the theme song for the movie. Click the link below for more information on the film

Answer 2

I'm not sure, but it sounds like a canoeing reference to the movie Deliverance, and the song Dueling Banjos.

I guess the counterpoint for banjo pickers would be "Play louder, I hear a canoe on the water".