Probably "bleach by-pass" plus the black levels are artificially raised and the overall chroma is reduced.
For you young'uns, bleach bypass is a term from the days of chemical based photo and film developing, where the exposed film goes thru several stages of exposure to various chemicals in trays or tanks. One day somebody skipped a step and got the resulting blue-green overcast "look". Some people think it's cool, or that it gives a certain mood. It's also been overplayed quite a bit.