Do some guys have two slits? I have a friend whose pee comes out in two streams when he starts.
Usually this is the result of tackiness or stickiness near the end of the urethra, perhaps due to residual cum, etc. or just the mucosal surfaces sticking together temporarily.
But there are some guys with dual streams due to their meatal opening. This guy has an honest-to-goodness top hole and lower hole; it almost looks like it could be a thin skin bridge across the meatus. Makes peeing very... interesting. The split is even clearer in some other videos.