1. Something that is considered important or consequential. Being the first in her family to graduate college was a big deal to Katie. I'm kind of a big deal here, but I'll just be the new kid when I switch schools.
2. Who cares? That's not impressive or important. So you did 20 push-ups. Big deal, I can do 100. A: "Wow, a 1969 Mustang!" B: "Big deal. It's just a car."
1. A matter of great interest or importance, as in Performing in Symphony Hall is a big deal for everyone in the chorus. [c. 1940] Also see under make a federal case out of.
2. So what? Who cares? For example, So you got the job after all-well, big deal! This use of the phrase as an ironic interjection dates from approximately the same time.
big deal!used to express contempt for something regarded as impressive or important by another person. informal
See also: big
big ˈdeal(informal, ironic) used for suggesting that something is not as important or impressive as somebody else thinks it is: ‘I’ve got tickets for next Saturday’s football match.’ ‘Big deal! Who’s interested in football anyway?’
1. n. something really important. Don’t make such a big deal out of it!
2. exclam. So what!; What does it matter? (Usually Big deal!) So he snores! Big deal! Snore back!