* A misspelling: Perhaps you meant a different word, like "contestas" or "contestantes."
* A slang term: It might be a slang word specific to a certain region or community.
* A made-up word: It's possible that it's a word invented for a specific purpose.
To help me understand what you're looking for, could you provide more context?
For example:
* Where did you hear this word?
* What was the situation?
* What language was it spoken in?
With more information, I can help you figure out what "contestalas" might mean.