The act of grating the dried seminal and vaginal fluid from your cock on to a persons face. This is made better if either party is suffering from a reproductive oragan discharge, as this adds to the quantity of "cheese" that can be milled!
Gareth: Hey Mate! What did you do this morning?
Guy: Not much, I had breakfast in bed and then cheesemilled my wife! She loved it as I currently have ghonneria!