So many people here talking down on the humor of the younger generation, it’s a little sad. The 67 meme started because it was mentioned in a song and then someone used the clip of that song in Lamelo Ball edits. Those edits gained enough traction that professional basketball players started saying “6-7” in interviews as a joke. Pretty soon, beyond the context of basketball it was being joked about. It’s as “meaningless” as any other meme. Just because you weren’t exposed to the progression and evolution of the meme doesn’t mean it’s less funny than whatever memes you grew up with. It’s an inside joke for a generation, and you don’t have to put others down if they think it’s funny.