I had some meat in the freezer and it got grayish brown spots on it. Does that mean it's bad?

Those spots sound like freezer burn, which will not make you sick, but will make the texture of the meat unpleasantly dry. It happens when the surface of the meat comes in contact with air. No worries: simply cut the discolored sections away and the rest of the meat should be fine.

For more tips on storing foods in the freezer, see our Fill-Up-Your-Freezer Storage Guide.