"Text-book" Natural Recordings by Native Speakers
A standard or basic book on a particular subject, typically regarded as authoritative or widely accepted as a guide.
For example: "The student used a textbook to help her study for her exam."
I'm not familiar with the word "tewtaw." It's possible that it's a misspelling or a word from a non-standard dialect. Could you provide more context or clarify the word you are looking for?