A modern insult derived from the commonly used Silly Goose.
When someone does something particulary strange yet funny you call them this.
Little Timmy is dancing around with a diaper on his head.
Suzie: Oh Timmy, you are SUCH a silly moose!
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Originated from an apocalyptic cult. Slang term used for a viking warrior god with a coffee addiction.
But we're here to bring about the apocalypse silly moose.
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Calling someone a silly moose means that they are acting silly and acting like a dickhead at the same time.