It has no significance other than being started by some kid in a video, but ultimately means nothing

it's not "sixty seven" but six seven or rather six seveeeeeen !

https://youtu.be/laZpTO7IFtA

I'd classify it as an anti-meme. Its funny because ???

As far as i can tell, when you have to ask that, the answer is usually: cringe

No soap, radio

From what I’ve understood there was this rapper who gave a shoutout to his home street in a song (with the hand movement) so wannabe tough gangsters (14 year old children) started mimicking that?
Then the internet would make fun of them by doing the same thing but ironically and from there it all went to shit 💔

6 7 (six seven) is slang to mean ok. Though upon googling it says it means nothing.