When I was growing up, to "snuff" somebody meant to put your hand, the side of your hand in particular, on their forehead right above the nose, and then to push their head backwards in a dismissive fashion. To use your whole palm on the side of their face was more like a "mush."
Now these days a "snuff" means a punch. When did this happen?
I don't condone snuffing or mushing of any sort.