Green’s Dictionary of Slang

trapeze artist n.

[artist n. (1)]

1. a sexual contortionist.

[US] ‘Hotel Sl.’ in AS XIV:3 Oct. 240/2: trapeze artist One who indulges in unnatural intercourse.
[US]Maledicta III:2 232: He also may or may not know the following words and expressions: [...] high russian (both kinds of ‘sodomy,’ anal and oral, simultaneously; it takes a trapeze artist).

2. (US tramp) a tramp who rides the trains.

[US]‘Dean Stiff’ Milk and Honey Route 216: Trapeze artist – A hobo who rides the gunnells or rods.
[US]Monteleone Criminal Sl. (rev. edn).

3. a woman who enjoys cunnilingus, esp. as part of sex exhibitions.

[US]G. Legman ‘Lang. of Homosexuality’ Appendix VII in Henry Sex Variants.

4. (US gay) a fellator.

[US]B. Rodgers Queens’ Vernacular 52: fellator [...] trapeze artist (’40s).