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: The phrase likely originated from the song "Doot Doot (6 7)" by the American rapper Skrilla.

: It was early on associated with NBA player LaMelo Ball, who is 6'7" tall, and popularized further by Overtime Elite player Taylen "TK" Kinney. 67.jpg

: According to Georgetown University , using "67" helps kids build relationships and social worlds by signaling awareness of the latest inside jokes, even if the communication isn't transactional. : The phrase likely originated from the song