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1.
The name of the scale that rates the chances of being struck by your own piss when using a particular urinal. Especially true for oddly shaped/positioned urinals.
"Dude, the urinals here are 4 feet off the ground damn ground, I had to back a bit and on my toes to avoid the splash factor."

"Damn it, now I need to wash my pants, that fucking toilet has to be splash factor 9!"
by ninety99nine October 21, 2011