Kids say certain phrases or slang repeatedly mainly because they find them fun to say, enjoy playing with language, and want to connect with what’s popular among their peers. These phrases often have catchy rhythms or sounds that linger in their minds, and repeating them can be a way to express themselves, feel connected, or simply pass the time. Many of these expressions come from online culture, social media trends, or viral memes, which spread rapidly among kids today. This behavior of repeating slang and catchphrases is not new but has accelerated due to the internet and platforms like TikTok, where kids are exposed to a high volume of trending content. Sometimes, the repetition is just playful, with no specific purpose other than enjoyment, while in other cases, it can be a form of self-expression or communication within their social group. Unless it becomes excessive or linked to deeper issues, it is generally considered normal childhood language development and exploration.
For example, kids saying "six seven" repeatedly is part of a viral trend stemming from a meme and a song, and while it may sound nonsensical to adults, it holds social meaning and appeal for kids. Similarly, kids might say phrases like "sigma," "sus," or "yeet" which are part of youth slang with specific meanings socially constructed among peers.
In summary, kids say various trendy or nonsensical phrases repeatedly because it is a fun, social, and developmental way for them to engage with language and their peers.