Pissing against the back wall of the urinal at a 90 degree angle will cause extreme backspray. Thus, a man must strategically place his piss stream onto the side wall of the urinal, prefferably at less than 20 degrees to prevent getting back-sprayed.
Dude I was pissing in the urinal, and I forgot to adjust my Piss Angle
Bro, never forget to adjust your Piss Angle
I gotta go take a piss guys
Mind your Piss Angle, Bro!