1 definition by TomJackson404

a victim has a card e.g a credit card forced inside there mouth, then the attackers punch the victim in the stomach to make there muscles tighten, making the mouth snaller, the card digs into the skin and makes a "grin" at the sides of the victims mouth.
a chelsea grin is performed on greenstreet
by TomJackson404 December 24, 2008
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