When kids say "six seven," it is a popular meme phrase that originated from a rap song called "Doot Doot (6 7)" by Skrilla, which went viral around late 2024 and early 2025. The phrase "six seven" has no specific or fixed meaning; it is mostly used as a hype or funny saying among kids and teens, often repeated for social connection and shared humor. It is sometimes associated with basketball player LaMelo Ball, who is 6 feet 7 inches tall, and can also be interpreted as meaning "so-so" or "very tall," depending on the context, but often it just functions as a nonsensical phrase that kids find entertaining to say aloud. The repetitive use of "six seven" helps kids feel included and part of a social in-group, similar to quoting a favorite line from a show or meme.

In summary, "six seven" is essentially a viral meme phrase from social media culture with playful and ambiguous meaning, primarily used by kids and teens as a social signal or joke without deeper significance.