Here are some possibilities:
* "Butas" means "hole" or "perforated." This might be a misspelling.
* "Butong" means "seed" or "kernel." This might also be a misspelling.
* A regional dialect term: It's possible "butu" is a word used in a specific region of the Philippines.
To help me understand, could you provide more context?
For example:
* What was the sentence where you saw "butu"?
* Who said it?
* What was the situation?
With more information, I can give you a more accurate answer.