Why? Because other kids say it. And they say it because the cool kids said it. And the cool kids picked it if from some cool adult that used it once because they thought it was funny.

Even they don’t undestand why. It’s just group behavior to feel “cool” because others don’t understand them and feel ashamed for it

I thought so, too. Then I remembered that I thought that “E” was funny as fuck back in 2018… I think that dadaism is just funny to some kids/teens(or in my case some adults…)

Yup, still a thing for kids here in Hungary as well. Except they usually say it “Tizen-három” because it fits the sound better and is… 6+7.

Well I hear it in France too, but in English.