What does 6-7 meme mean, and why is it being banned from classrooms?

EVERY generation has a new range of references and memes, and one of the latest from Gen Alpha is “six-seven”. Here’s everything you need to know about the numerical phrase, so you can understand what the kids are on about. What does 6-7 mean?  The phrase "six-seven" is a viral internet meme and slang term...