"Jingo" was a word associated with medieval conjurers and showman. It meant "By magic", used in a show like "hey presto!". It was thought to be a substitute word for "By Jesus" i.e. a non blasphemous exclamation or fr emphasis - i.e. "I'll do it by jingo!" I've heard it used like that, particularly by older Australians.
Very interesting. It's good to see something useful come out of this troll...
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