The Grinning Man is the name given to one or more mysterious figures that has become associated with various reports of paranormal activity. The grinning man has been reported to be wearing a sparkling green coverall costume with a wide black belt around his waist. He has a very dark complexion, and little round eyes real beady set far apart.
If you see this man get the fuck away from wherever you are and run as fast as you can.
Smiling all in a person's face, trying to gain their favor. Usually a person that is skinning and grinning is being fake or phony, flattering, or flirting. Trying to impress or befriend a person. Often they don't really like or respect the person and since they aren't being sincere, they are just skinning and grinning.
person 1: My boss always gives me so much more work to do than everybody else.
person 2: Really? Why do you think that is?
person 1: I don't know, probably because I'm not always skinning and grinning in his face like the other people there.