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As you get ready to run a train, the oxy contin (or any other painkiller) kicks in so hard that you cannot get a boner at all. Similar to whiskey/beer dick in that you are so fucked up that not a thing is gonna work. People experiencing OC dick generally experience frustration, dissappointment, and/or no nut.
Guy1: Yo I was tryin everything last night to get a boner, she was suckin my dick so good, but just couldn't cause of OC dick.

Guy2: Fuckin OC
by jerry weir August 15, 2009
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