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Mark might refer to:
The fall guy, dupe, target, or victim in a scam. In other words, another carcass on the road to riches for the scammers, whether they be pseudoscientific or just plain criminals. In the TV show, The Real Hustle, presenter Paul Wilson uses the term in his pseudonym "Rob Marks" in reference to the fact that he is robbing his marks.
A pro wrestling fan who believes it is real due to its nature of being presented as real when in reality the results are pre-determined, as opposed to fans who know that it's scripted (called smart marks or "smarks" for short).