Top Definition
Laying down flat on the toilet to pee. Usually necessary due to a boner, because you’re not sure about your aim, or you’re bored with standard peeing strategies.
- James: "I saw Zac Efron horizontal peeing in the trailer for that movie That Awkward Moment and decided to give it a try."
- Mike: "How'd it go?"
- James: "Good. I touched the water.”
by 23419 January 08, 2014
5 Words related to Horizontal Peeing

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