What's the big whoop?

Meaning

A dismissive phrase used to suggest that someone is overreacting to a situation. It mocks the importance of the event being discussed.

Dismissive, sarcastic

Used in a sentence

• So you got a coupon for fifty cents off? What's the big whoop?
• He was bragging about his new tie like he won an award, so I asked, what's the big whoop?
• I don't see why everyone is crying about the change in the office coffee brand, what's the big whoop?