The distance that toilet water travels when a piece of crap falls from your butt hole and splashes into the toilet.
If a Splash Radius is Danger Close, it usually means that the water is splashing you on your butt cheeks.
by jokjok2796 April 25, 2010
A rule that states: When a man is choosing which urinal to pee in, he must keep at least one urinal between him and the man next to him(if possible). This is to avoid the "splash" of urine from one man onto the other.
Seeing that there was someone else using a urinal, John decided to use the urinal 2 away from the man to avoid breaking the splash radius rule and getting the man's urine on his clothing.
by balbusch4nstk3 January 22, 2009