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The NotMyGrandpa phenomenon appears to have originated from a series of online interactions, likely on social media platforms such as Twitter and Reddit, where users began sharing images, videos, and stories that poked fun at the idea of a certain individual being referred to as "grandpa." The term "NotMyGrandpa" quickly gained traction as a hashtag, with users employing it to express their skepticism or outright denial that a particular person could be considered a grandparent.