1cm cut on ripped pee hole require a stitch need expert?

Umm, I would definitely get that checked out by a doctor before it becomes infected. I would also abstain from putting things in your penis in the future. I'm guessing you got this injury by "sounding" or some other crazy sex fetish. You may very well need stitches. The only way to tell if to have a trained professional look at your penis. Good luck!