Feets dont fail me now is a Little Feat song. Berman often employs parts of classic rock songs and word plays on players names.
Are you all that young? It is a quote from old movies where StepinFetchit (a very stereotypical black character) would be in a dark room in a spooky house and hear a strange noise or see some vague ghostly movement and his eyes would bug out and he's say, "Feets, don't fail me now!" And then he'd run like crazy.
I think most people over the age of 18 would realize the phrase was not originated in a Little Feat song.