I do it because I'm speaking how it would come out over here in the real world - it's just a habit, it's informal. I don't use it to try and make people feel uneasy, it's just how my family around me spoke when I was growing up.
Now, if I was very serious, I'd use "proper" words instead of substituting adjectives.
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A man walks into a zoo. There's nothing there but one dog. It was a shih-tzu.
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