Green’s Dictionary of Slang

(US black) a female lover, a girlfriend.

1928		Tommy Johnson ‘Cool Drink of Water Blues’ 🎵 How long has this east-bound train been gone? / It done taken your fairo.
1935		Willie Lofton ‘Dark Road Blues’ 🎵 Who that yonder comin’ up the road / Cryin’ it look like my faro but she walk too slow.