It's possible that:
* It's a misspelling: There might be a similar word you're thinking of, like "dingy" or "wit."
* It's a slang term: It could be a regional slang or a term specific to a particular community or group.
* It's a made-up word: Someone might have created the word for a specific purpose, like a fictional story or a joke.
To help me understand what you're looking for, please provide more context:
* Where did you encounter this word? (e.g., in a book, conversation, online)
* What was the surrounding text or conversation?
With more information, I might be able to figure out what "Dingwit" means.