Green’s Dictionary of Slang

(Aus.) a cunnilinguist.

1966		Trimble 5000 Adult Sex Words and Phrases.
1972		B. Rodgers Queens’ Vernacular.
1980		Maledicta IV:2 (Winter) 198: On the other hand they may indulge in a 69, with reciprocal muff-noshing and knob-gobbling, if they are both linguists.