Art, I'm glad you straightened me out on that one. I thought he was talking about rancid butter.
When I was a college student in New Jersey in the early 70s, I used to whistle the theme song of The Smothers Comedy Brothers Hour while I walked around campus at night selling hoagies. I also used to whistle "The Green Leaves of Summer" during gross anatomy lab. It seemed to help.

Aloha,
Mark