A strange new phrase has taken over schools across the country, and teachers say they’ve had enough. The term “6-7” started as a simple joke on TikTok, but now it’s spread to classrooms, causing chaos during lessons and even leading to suspensions.

It all began when a viral video challenged students to shout “6-7” during math class and record the teacher’s reaction. Within days, thousands of clips flooded social media — students laughing, teachers confused, and chaos breaking out mid-lesson.

Educators say the prank is becoming disruptive. “Every time I write the number 67 on the board, half the class starts giggling,” one teacher explained. “It’s impossible to keep them focused.”

So what does “6-7” actually mean? According to students online, the numbers are used as a coded reference for something completely unrelated to math — a private inside joke that spread through TikTok’s algorithm. Some say it refers to a hidden audio trend, while others claim it’s just nonsense designed to confuse adults.

Whatever the origin, teachers across the U.S. and U.K. are warning that anyone shouting “6-7” in class could face detention or suspension. “It’s not funny anymore,” said another teacher. “It’s turning lessons into a circus.”

Experts call it another example of Gen Alpha’s ability to turn random online humor into real-world disruptions overnight. “Kids today can take a single meme and make it a movement,” one digital culture analyst said.

Whether it’s harmless fun or a growing problem, one thing’s clear — for teachers everywhere, the numbers 6 and 7 will never sound the same again.