* It's a misspelling: Perhaps you meant a different word, like "theenkattiya" or "theenkatti".
* It's a regional term: It could be a term used in a specific region or community, but not widely known outside of that context.
* It's a made-up word: It's possible it's a fictional term or a personal invention.
Can you provide more context?
For example:
* Where did you hear this word?
* What was it referring to?
* Any other words or phrases related to it?
With more information, I can help you figure out what "theenkathiya" might mean.