1 definition by Smurg

Top Definition
When one is feeling in need of furious urination. From: "I need to piss like a racehorse".
Guy 1: What's the matter with you man? You're twitching like a dying badger.
Guy 2: I've had 5 beers without going for a piss, I'm racehorsing man!
by Smurg December 09, 2009

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