Here are some possible interpretations based on similar-sounding words:
* Grumbling: This is the most likely word. It means to complain in a low, unhappy voice.
* Mumbling: This means speaking in a low, unclear voice, often making it difficult to understand what someone is saying.
* Gobbling: This means eating something quickly and noisily.
If you could provide more context about where you encountered this word, I might be able to give you a more accurate answer. For example, were you reading a book, watching a movie, or hearing someone speak?