Here are some possibilities:
* A fictional word: It could be a word from a book, a game, or another creative work.
* A regional slang term: Some words have very localized meanings. If you heard it in a specific place, there might be a regional slang meaning.
* A misspelling: It's possible the word was meant to be something else entirely.
To understand the meaning of "pobble," you need more context.
* Where did you hear it?
* What was the situation?
* Was it written or spoken?
Providing more information will help us figure out what "pobble" actually means!