Have you heard about 2025’s word of the year? It’s causing a bit of controversy because it’s actually not a word. “67” (pronounced six-seven) is all the rage with Gen Alpha, a phrase often accompanied by an up and down hand movement.

Though it originated in the lyrics of a song by Philadelphia rapper Skrilla, and even in that context doesn’t mean anything in particular, it has become inescapable in 2025, causing outright bans on the phrase in classrooms as well as extensive head scratching by parents.

The “67” phenomenon has been, much like the rest of Gen Alpha’s vernacular, attributed to algorithms and brainrot culture. But other than its initial spread via TikTok, there’s not much that separates “67” from centuries of absurd, nonsensical kid culture.

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This whole “67” thing may be foreign to you, but you probably grew up singing “Miss Mary Mack” or shouting “Kobe!” or drawing a Superman “S” in your notebooks—or something along those lines. These are all examples of children’s culture studied by Iona and Peter Opie. And their work might be the key to finding the meaning within the seemingly meaningless “67.”

The Opies were a British couple who dedicated their lives to the study of children’s folklore, games, traditions, and beliefs.

Their first book was a collection of nursery rhymes, but the Opies published numerous books which fully documented child culture—not as it was remembered by adults later in life, but as it actually was, existing and evolving in real-time.

From the 1950s through the 1980s, Iona and Peter traveled throughout the UK, observing children on playgrounds and in schools, recording their rhymes and interviewing them about their pastimes. They also built up a network of hundreds of teachers, parents, academics, and children themselves all around the English-speaking world, who filled out surveys and corresponded with the Opies.

Thousands of children ended up contributing directly to the Opies’ fieldwork, and their many published books and extensive archive, currently held by Oxford’s Bodleian Library, are an incredibly valuable trove of firsthand documentation of the lives of postwar children in the UK and elsewhere.

The Opies were outsiders to the academic establishment, technically amateurs without degrees, who nevertheless made an enormous impact on the fields of folklore, childhood studies, and ethnology.

Part of their obsession with documenting children’s traditions had to do with refuting an idea, common at the time, that television and mass media was “ruining” childhood. (Sound familiar?)