guy 1: dude, why is there piss all around the toilet?  guy 2: sorry bro, i had a beam splitter and it went everywhere
a piece of hair that partially covers a guy's pee hole, causing urine to go in two different directions
"guy 1: dude, why is there piss all around the toilet?  guy 2: sorry bro, i had a beam splitter and it went everywhere" What is the definition of "beam splitter"?