This has some current popularity, maybe esp. among teenage girls? It seems to mean something like "You've got to be kidding," "You must be joking," "That's hilarious."
Примеры использования:
When I say "Shut up!" I'm not being rude, I simply mean it's too wild to be true.
And a long ago some people used to say "Well, shut my mouth"
to express surprise at something that was happening.
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