Meaning/Usage: Used when someone succeeded financially
Explanation: Very similar to the idiom "you made it" but includes the word "big" The word "big" is talking about money so it is expressing to someone that they have succeeded financially.
I can't believe you have your own business! You made it big!
I can't believe how nice your house is. You made it big.
You made it big! Your parents will be proud of you.
A.
So how have you been?
B.
I've been good. I live in Beverly Hills with my wife.