What does wadda mean?

"Wadda" is a slang term that is most commonly used as a shortened version of "what the". It's an expression of surprise, disbelief, or frustration. It can be used in various contexts, similar to how you might use "what the heck" or "what the..."

Example:

* "Wadda you doing here?"

* "Wadda a mess!"

It's important to note that "wadda" is considered informal and might not be appropriate in all situations.