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A Chelsea Grin (also known as a Chelsea Smile or a Glasgow Grin) is an act popular among British gangs which involves making a cut from the side of someones mouth all the way up to their ear. Due to the cut, it appears as if the victim is smiling. Thought to have originated from Glaswegian criminals but became popular among British football hooligan firms, in particular the Chelsea Headhunters.
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