* A misspelling: Could it be a mispronounced or misspelled word? If you can remember any context or how it was used, that might help clarify the intended word.
* A regional term: It might be a slang or dialectal word specific to a certain region of the Philippines.
* A fabricated word: It's possible it's a made-up word for a specific purpose.
To understand what "bulang-gugo" might mean, please provide more information:
* Context: Where did you encounter this word? What was the situation?
* Possible intended words: Do you remember any similar sounding words?
* Your understanding: What did you think it might mean?
With more details, I might be able to help you find the correct word or meaning.