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Weird stuff on mesh?!

How do i fix this? does it have todo with uv? or wut is it?

Your question is to vague. Maybe your smoothing groups are wrong, maybe a normal thing, maybe your light map resolution. Provide more feedback to get better answers.

Because he cannot provide more detail, he has no idea. Also, likely check your smoothing groups, I have seen stuff like that before, it’s incredibly annoying to deal with.