To understand what you might be referring to, could you please provide more context? For example:
* Where did you hear the term "grizzly jaw"? Was it in a book, a movie, a conversation?
* What was the context of the term? Were they describing someone's appearance, a medical condition, or something else?
* Can you describe what you think "grizzly jaw" might mean?
Once you provide more information, I can better understand your question and potentially give you a helpful answer.