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"What's the big idea" is a phrase used whenever a person has a stupid, impossible, or pointless idea and someone needs to tell them off without being too rude.
Jason: "Dude, let's go smoke weed in public!"
Mike: "Oh, really? What's the big idea? Get arrested?"
Jason: "Uh,'s to have fun."
Mike: "In jail? Are you barred again?"
by jacrispy vulcano is my mom December 23, 2017
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