Green’s Dictionary of Slang

(US black) the clitoris.

1935-39		H. Prosper 🎵 in R. McKinney coll. for Federal Writers’ Project When ya suck a woman an she begin to come / Tickle her purry tongue wid ya tongue.
1935-39		E. Easter 🎵 in R. McKinney coll. for Federal Writers’ Project Den she tickles me under de arm and den in de face / An kisses me an reaches down an put mah purry tongue back in place.
1935-39		J. Beasley ‘Black Rider’ 🎵 in R. McKinney coll. for Federal Writers’ Project Mama, let’s go to bed and let’s turn de light low / Ah’m gwine to play wid ya purry tongue until de damn thing grows.
1978		R. Charles Brother Ray 118: [B]ack on my old stompin’ grounds, I could usually find some purr tongue. (That’s the word us country boys used for clitoris.).
1992		(con. 1910s) F.M. Davis Livin’ the Blues 36: At an early age we talked about a ‘purr-tongue’ or a ‘boy-in-the-boat’.