Green’s Dictionary of Slang

a fellator (thus generic for a male homosexual) or fellatrix.

1757		in ‘Alan Edwardes’ Rape of India (1966) 180: ‘In short, he is a Compound of every thing that is bad, keeps company with none but his Menial Servants (all of whom are Fluters..)’ [Simes:DLSS].
1904		Number 1500 Life In Sing Sing 248: Fluter. A degenerate.
1931		Irwin Amer. Tramp and Und. Sl. 201: The men and boys who persist in singing or reciting this muck are regarded as ‘mousers’ or ‘fluters’ and as such avoided.
1941		G. Legman ‘Lang. of Homosexuality’ Appendix VII in Henry Sex Variants.
1949		Partridge DSUE (3 edn) 258/1: fluter. A male sexual degenerate; passive, and esp. in the sense of one addicted to penilingism.
1950		Goldin et al. DAUL 72/2: Fluter. See Fag.
1965		Guild Dict. Homosexual Terms 16: fluter (n.): A fellator, as used by heterosexuals. (Rare.).
1977		Maledicta 1 (Summer) 16: The disliked person is accused of being a fag (or Three-Letter Man), a faggot, a fairy, a pansy, a queer, a fruit, a fluter, or the Queen of the Flits in Hoboken.