How do you spell boop tee boop?

"Boop tee boop" is a phonetic spelling, meaning it's how the phrase sounds. There isn't a standard spelling for it, as it's more of a silly sound than a real word.

If you're trying to write it down, you could use "Boop-tee-boop" or "Booptyboop." It really depends on the context and what you're trying to convey.