Definition

Short for 'Crazy Gamer'—someone who treats a single video game like a full-time job, racking up thousands of hours as if those are just warm-up numbers.

Example Usage

He's got 15,000 hours logged in World of Warcraft; that dude is basically a professional CGM.

Source: Urban Dictionary (https://www.urbandictionary.com/define.php?term=CGM&defid=5954460)

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