Green’s Dictionary of Slang

mole n.3

[mole n.1 (1) but note Heb. mohel, one who performs ritual circumcision]

(US) in sadomasochistic scenarios, a dominatrix who slits or pierces her masochistic client’s penis; thus the penis thus pierced or slit or the man who has such a penis.

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[US]information provided by vice squad, Columbia Police Dept. Murray & Murrell Lang. Sadomasochism (1989) 96: Experienced dom seeks potential moles.