It's possible:
* You've misspelled a word: Is it a different spelling altogether? Maybe you meant something like "carillon" (a set of bells played musically) or "koran" (the holy book of Islam)?
* It's a regional slang term: "Korlong" might be a term specific to a certain region or group. If you can provide more context (like where you heard it or what you think it might be about), I might be able to help.
* It's a made-up word: Could it be a word from a fictional story or game?
Please provide more information so I can help you understand what "korlong" might refer to.