What's the deal with "el pete ete sech"?

For context: here are some videos I found. https://youtu.be/sJFWj6SAh9k https://youtu.be/Y1zl6WgZSAw https://youtu.be/DPVrA0lyFOA

Even though I don't speak Spanish, in recent days my YouTube recommendations were FLOODED with videos with something in common in the title: "el pete ete sech". I still don't know exactly what this means. Maybe it might be slang from a foreign country?