Designating or involving sexual activity in which the genitals of one partner are stimulated by the mouth of the other. Cf. cunnilingus, n., fellatio…

slang (originally and chiefly U.S.). With reference to sexual activity: consisting of or involving fellatio or (sometimes) cunnilingus. Of a…

Of sexual activity: involving contact between the mouth of one person and the genitals of another. Cf. oral, adj. 3b.