thirty-three, n. — Green’s Dictionary of Slang

thirty-three n.

also 33

[the ‘slowest’ of the old-fashioned vinyl recordings, the 33, played on a turntable at 33 r.p.m]

(N.Z. gay) for a male sex worker, a client who feaches orgasm slowly.

2010

W. Ings ‘Trolling the Beat to Working the Soob’ in Int’l Jrnl Lexicog. 23:1 76: A seventy-eight (78) made reference to vinyl records that were played on a turntable at 78rpm. A client who took a long time to ejaculate was called a 33 (from 33 rpm, the speed of larger, long playing albums).