RWilhelm is right in saying the CD liner note transcriptions give "faro". I only know that as a card game so unless it is US slang for a young lady, "Sarah" makes more sense when singing it. Hey, I make up verses & mangle words in blues all the time- it's the folk process!

RtS
"You ain't nothin' but a Hound Dog- a-humpin' on mah leg..." (C)RtS