piss like a racehorse
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- (vulgar, idiomatic) To urinate profusely, especially in reference to a profound need to do so.
- Pull over as soon as you can. I need to piss like a racehorse!
- David Sessions, "Does a Racehorse Pee Like a Racehorse?" Slate, 8 June 2007.
- "The Origin of the Expression 'Piss Like a Racehorse'", Today I Found Out, 21 July 2015.