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When you strip a girl naked and get her nice and wet. then you rub her down all over her body until she cums all over you. by the time you are done with her, her vag should be the color of a penny, thus the word "copper" rub.
Tom: Yo did u fuck that chick last night

John: Shut the fuck up man

Tom: Come on man tell me, did you give her a lil copper rub???
by ballsdickasstitsballs July 18, 2010