A chick who the guys hang out with cause shes almost as cool as the bros. Bros tend to be really tight with these girls. Usually not stuck up at all, and bros can still talk about chicks in front of her without her getting jealous. They get the "Chick-Bro" term cause you cant call her a bro, shes a chick. Also, can be 1, or mulitple girls.
Zack: Bro, that chick is so cool, i just talked about titts with her and she didnt even get mad.
Mark: Ya dude, shes a Chick-Bro
Zack: Dude, who are those girls always hangin around you?
Mark: OH! Those are my Chick-Bros. They're so tight.
the chick that can hang out with the bros. chickbros tend to be a bit rebellious by nature and not really care what people think. chickbros can still be very girl, just enjoy the company of guys and vise versa.
guys like chickbros because they can trust them and make fun of them without them getting insecure.
a lot of times chickbros get the jokes that their bros tell when their bros &/or girlfriends don't get.
her: "sup broski! -laughs-"
him: "sup chickbro!"