Green’s Dictionary of Slang

calm adj.

(UK black) general term of approval.

hubpages.com ‘Roadman Slang 10 Jan. 🌐 Calm - ‘calm’ can either mean ‘really nice’ (e.g. ‘it was so calm, we had the flat to ourselves’) or ‘okay/fine’ (e.g. ‘it's calm, I didn't like him anyway’).