I’m American and yeah definitely the “it spawned in my head.”

Also the same happens for other languages too, though I’m not around them enough to attach meaning to it. But I’ll dream different languages or hear Russian and French in my head sometimes and have no idea what it means.

What’s crazy is that everytime I’ve remembered and been able to type them out, they are legitimate phrases not just nonsense. I guess my mind just picks up phrases it hears and doesn’t attach the meaning to them fsr just repeats them.