What does 6 7 mean as South Park does an episode about the viral TikTok meme that has hand gestures and teachers banning it?

and that is the meme ... do, the whole meaning and use of 6-7 evolved. The most important iteration involved a kid at a basketball game effectively using the lyric, paired with an up-and-down hand ...

Kids are driving their parents and teachers insane with the repetition of the numbers ‘6-7’, but what does the meme mean, and ...