Green’s Dictionary of Slang

baff n.

[supposedly mimicking the ‘sound’ of ejaculation]

(S.Afr. gay) semen; thus as v., to ejaculate.

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[SA]K. Cage Gayle 55/2: baff n. semen (You ever had baff in your eye?) v. have an orgasm (I want you to baff all over my chest).