What does the phrase “earns the big bucks” mean?

The phrase “earns the big bucks” is simply used to refer to someone who makes a lot of money.

Here’s an example of it’s usage:

Earns the Big Bucks In a Sentence

Bob:  “Hey Tom, great job getting that project done 
before the deadline”

Tom:  “Thanks Bob, I guess that’s why I earn the big bucks.”