* It's a misspelling: Could you be thinking of a similar-sounding word? Providing more context (e.g., where you encountered this word) would be helpful.
* It's a dialectal word: Irish has many dialects, and some words might only exist in specific regions.
* It's a loanword: It could be a word borrowed from another language and used informally in Ireland.
Without more information, it's impossible to say what "kori" might mean in Irish.