Top Definition
A dirty, male penis. The male with a Rusty Shank has sex with multiple partners, generally over the course of a day, and stabs that knob in any hole he can penetrate. The hallmark of the Rusty Shank is neglecting to wash the genitals in between sexual encounters.
After banging his secretary at the office, Roger left and picked up a prostitute for a quick $10 anal. He then went home to his wife and fed her a Rusty Shank while watching Netflix.
by Auna Bender December 07, 2015
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