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I believe it’s because it was traditionally “wagons ho!” which was probably seen in films.

And I think non-union tradesmen were often thought of as doing things their own way. Maybe even the slightly wrong way.

I think the term “homemaker” applies

My cat was an “old man cat” for a while before he passed.

Anyhow, a “man cat” just sounds like a cat who dresses up like a man and fights crime