Potluck is a device that randomizes the good Doctor's destinations. It was installed to protect him from the Black Guardian. Or in his words:

Doctor: "Hence, this new device. It's called a randomizer, and it's fitted to the guidance systems and operates under a very complex scientific principle called pot luck. No one knows where we're going, not even the Black Guardian."
Romana: "Not even us."

This was the Tom Baker Doctor Who, circa 1979. I haven't watched much since the mid-80s, but it was always a fun Saturday night!
Source(s):
http://www.amk.ca/quotations/doctor-who/page-4
Amazon
http://www.drwhoguide.com/who_5f.htm


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