Unpleasant form of assault: a blade is used to cut two small nicks in each corner of the victim's mouth (where the top and lower lips meet). This in itself isn't too bad, but the following knee to the victim's groin causes them to grimace or cry out in pain, and consequently tear the flesh of their cheeks up to the ear, giving them the grisly "Chelsea Grin".
I've no idea if this works, but it was often threatened in school. The concept certainly works visually.
The Chelsea connection may have something to do with the practice being invented by followers of Chelsea football club.

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