What does the word "big boys" refer to? Is it a common phrase in western culture?

Native speaker’s answer
Rebecca
"Big boys" refers to a group of men or boys who are more successful or have more respect and status. It's a fairly common phrase! Ex: I heard you're finally going to play football in the major league with the big boys! Ex: As a small business owner, It's a lot of work to compete with the big boys.