What-s-the-big-idea Definition
phrase
What is the purpose?
Wiktionary
(US, colloquial, often preceded by hey) Used to express surprise or dissatisfaction with an action or statement of another, especially the person spoken to.
I heard you been chatting up my girl. What's the big idea?
Hey, what's the big idea, you telling everybody I'd left town?
Wiktionary
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