* A misspelling: It might be a misspelling of "wet," meaning covered in water or moisture.
* A slang term: It could be a slang word used in a specific context, like a regional dialect or online community.
* A proper noun: It might be a name or a brand name.
To help me understand what you mean, could you provide some context?
For example:
* Where did you hear or see the word "wetty"?
* What was the sentence or situation where it was used?
With more information, I can give you a more accurate answer.