No, it's quite unusual, and no, you would never find it in formal English.
It's an imitation of spoken language. The only place you would see this reversed style of speech written down would be in the transcripts of conversations, or maybe a film script. It's sometimes used in stories, particularly to show the speech patterns of characters who are of a lower social class. For example, a farm worker or cleaning lady in a story would speak in this way, to distinguish their conversation from that of more educated people.