cat lapper noun a lesbian; someone who enjoys performing oral sex on women US,1967
There are harsher and more widely used expressions: “Bulldyke,” “Amy-John,” “Cat-lapper,” “Les,” and so on. — L. Reinhard, OralSex TechniquesandSexPracticesIllustrated, 196
— Dale Gordon, TheDominionSexDictionary, p. 41, 1967