When Jennifer Trujillo first heard her middle school band students say “six, seven” in class and explode with glee, she sought out the advice of an expert — her 15-year-old daughter.

Trujillo wanted to know what, exactly, her students were saying when they’d repeat the numbers and moved their hands in a juggling motion. Her daughter gave her an unsatisfactory reply: “Mom, nobody knows.”

And yet, the phrase “six, seven” is being used by kids and teens seemingly everywhere. It’s gotten so maddening for adults that at least one school has banned the phrase “67.”

In an interview with the Wall Street Journal , which first reported on the trend, the phrase comes from a song by Philadelphia rapper Skrilla, who told the paper he never “put an actual meaning on it.”

Skrilla, whose real name

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