Here are some possibilities:
* A made-up word: People often create silly words for fun or to express a specific feeling or action.
* A regional slang term: Some words are common in specific regions or communities. It might be a slang word used in a particular place.
* A misspelling of another word: Perhaps it's a misspelling of a real word.
* A word from a fictional world: It could be a word from a book, movie, or game.
To understand the meaning, you need more context:
* Where did you hear it? Knowing the source can help determine the meaning.
* What was the speaker trying to communicate? The context of the conversation can provide clues.
Without more information, it's impossible to say for sure what "chiggy-wiggy" means.