A night of pr0n, or porn, dedicated to wining and dining with your left, right, or sometimes both hands and your favorite porn star in a free-for-all mastubation marathon by your terrible lonesome.
By definition, more interesting and productive than prom night.
Sam: Who are you going to prom with Jake?
Jake: Oh, I'm not going, I'm actually having a pron night, Melody Maxx is my date.
Sam: Damnit. Wish I was going to pron night.