I got the Red Berte from Boone and it says as an effect Crit charm, What dose that Mean?

It boosts your chances of a critical hit. IE more damage.

The beret adds +5 to crit chance. I don't know if that's 5% or what, but it increases your chance to score a critical hit. It also doesn't say crit charm anywhere, you wanna clarify?

This seems like a translation issue. Either poor translation of his copy or poor translation on his part.

But it's crit chance. Increased probability that a critical hit will occur.