* It's a misspelling. There might be a similar-sounding word you're thinking of.
* It's a slang term or regional dialect. Perhaps it's used in a specific community or area.
* It's a made-up word. It could be a playful term or used in a fictional context.
Could you please provide more context?
* Where did you hear this word?
* What was the situation?
* Can you provide any other details?
With more information, I can hopefully help you figure out the meaning of "krung krung."