"Cunning linguist" is a play on words.
Cunnilingus is the art of
stimulating the
vulva with the
tongue, alternately referred to as cunnilingctus. I first heard this particular little pun in the
Broadway show
Cabaret. The host person is introducing the
Cabaret girls, and the line is something like this:
HOST: Texas! (cymbal) Yes, Texas is from America . . . but she's a very cunning linguist!