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1.
A hard-on, or boner, or woody, or stiffy, etc., that you receive after listening to filthy, nasty, sexy, and downright ridiculous dubstep.
Caden - "Hey bro have you heard the new album mega-mix by UKFDubstep?"

Andrew - "Hell yeah dood that track gave me a raging dub-on!"
by 1010AJ1010 August 07, 2011