What does the idiom go-getter mean?

Answer 1

A go-getter is someone who goes above and beyond the Call of Duty. They work more than what is expected of them, and they do more than their share. The image is of someone who is "going" to "get" ahead in his or her career. You'd say this of someone who is working really hard to improve his career.
A "go-getter" is a very positive compliment and means someone who really tries hard to furfill their dreams or performs above and beyond the expected amount. This idiom is also applied to very ambitious people who are referred to as "real go-getters" meaning an ambitious person putting in a lot of hard work.