Green’s Dictionary of Slang

Buck Rogers time n.

[time n. (1); note US Army WWII Buck Rogers gun, an M-3 light machine gun; the fictional space hero Buck Rogers operates several centuries in the future]

(US prison) a prison sentence with a parole date set extremely far in the future.

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[US]Other Side of the Wall: Prisoner’s Dict. July 🌐 Buck Rodgers [sic] Time: A parole date so far into the next century, the inmate cannot imagine release.