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Noun. The microscopic particles of urine that bounce off of the urinal when urinating. Some or most of these microscopic droplets of urine end up on the urinator's pants, depending on the urinal.
"Darn it, that urinal has some serious backspray."

"Now I've got backspray all over myself. Those airport urinals..."
by TEBfan June 09, 2009
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