Wiktionary
big boys
n. 1 (context idiomatic plurale tantum English) The people or bodies with the most influence and/or power. 2 (big boy English)
Wikipedia
Big Boys
The Big Boys were a pioneering punk rock band who are credited with helping introduce the new style of hardcore punk that became popular in the 1980s.
Usage examples of "big boys".
The hares were to be given three minutes start of the little scholars and five minutes start of the big boys.
This move succeeded among the smaller lads, but the big boys turned from him with scorn.
But the big boys, the guys with the guns, are definitely Romulans.