Derived from the hispanic name Carlos, a Brolos is the token mexican bro who is compulsary for the functioning of any brommunity. His ethnic origins are often highlighted and hugely exaggerated to humerous effect by his other bros. Despite this, he remains a crucial and respected bro in the brommunity.
Trent: "Yo Chad where's José? He was suppposed to be crashing this party hours ago"
Chad: "Ah that dude is such a Brolos, he's probably eating a burrito or running from la policia"
Brothers (Friends, Homies, Buds, etc.) who all coordinate to wear as much Polo Ralph Lauren clothing as possible when they go hang out.
Susan: "Look at all those guys wearing Polo's"
Amber: "Yeah, you can tell they're Brolos"