Exactly the opposite of what you'd think it means when used by itself. "So you're wearing a blue shirt. Big deal." "So you're running linux. Big deal." "So you've won the lottery. Big deal."
A "big deal" can also be exactly what it sounds like: something meaningful or important. Usually in this context, "big deal" is used as a noun in a sentence as oppsed to being a complete (sarcastic) statement in and of itself.
Having air-bags in your car is a big deal.
It was meaningless to me, but when Jaime got the award, it was a big deal to her.
The opposite of a "big deal" is "no big deal". Of course.
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