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When a male is masturbating, he ejaculates, but the fast, steady, rythmic motion of his hand keeps propelling itself automatically, so that the semen ejected gets smeared all over the participant's penis.
I bet you were tarnishing your spud.
by Nate Perriweather August 06, 2006

Words related to Tarnishing Your Spud

cum ejaculate penis potato semen spud tarnish