From Latin "lingua" (tongue) and "Cunni" (cunts cunnus being the singular version), a cunnilingual is someone who is proficient at attaching his tongue to a pussy.

Those of us who can "speak" to the pussy are said to be "Cunnilingual"

Someone who speaks cunnilingus with great familiarity and proficiency. Said another way, proficient in speaking in tongues.

Cunnilingus is an oral sex act performed by a person on a female's genitalia (the clitoris, other parts of the vulva or the vagina). The clitoris is the most sexually sensitive part of the human female genitalia, and its stimulation may result in female sexual arousal or orgasm.

The art of orally making sweet love to a vagina.

A linguistic device of such cunning that all females are reduced to moans and squeals during it's application.

oral sex performed on the vagina