Green’s Dictionary of Slang

jamoke n.3

[ety. unknown; ? ext. of jamoke n.2 on pattern of dork n. etc, where the term means both a fool and a penis]

(US) the penis.

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[US]R.H. Rimmer Harrad Experiment 36: Your shorts don’t conceal a thing. I can see your jamoke, and it’s sticking in the air. [Ibid.] 134: ‘Would you make love with me anyway?’ Stanley asked. ‘Not until you had scalded your jamoke. Do you think I want to get diseased?’.