Green’s Dictionary of Slang

seventy-eight n.

also 78
[the ‘fastest’ of the old-fashioned vinyl recordings, the 78, played on a turntable at 78 r.p.m]

(N.Z. gay) fore a male sex worker, a client who feaches orgasm quickly.

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[NZ]W. Ings ‘Trolling the Beat to Working the Soob’ in Int’l Jrnl Lexicog. 23:1 76: Another term, seventy-eight, was used to describe a client who could be brought to orgasm quickly. A number of workers interviewed for this project used the term in the early 1960s. 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).