What's the big idea?(redirected from what is the big idea)
What's the big idea?
A question that expresses frustration or annoyance about what is happening and asks (at least rhetorically) for the reason or motivation behind it. Are you dancing with my girl? What's the big idea? Hey, what's the big idea? Why are you wearing my clothes?
See also: big
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.