Green’s Dictionary of Slang

gunner n.7

[gun v.1 (2)]

(US prison) a prisoner who masturbates while looking at a female warder.

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[US]Other Side of the Wall: Prisoner’s Dict. July 🌐 Gunner: A prisoner who masturbates while looking at a female correctional officer. Gunning (verb), Also referred to as a ‘sniper.’.