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Noun. A conversion among two or more very close Bros. Usually having to do with Sexual troubles pertaining to the opposite gender. When a bro-co is in progress time itself stops for this holy co-operation of men.
Max: Whats up?
Ryan: I need a bro-co.
*Time stops*
Max: What ales you my brethren?
Bro-co by HoneybadgerMax July 7, 2013
Bro-Co is the drink of the Bro. It is the combonation of Southern Comfort Black Label and Mountain Dew. With the fruity flavor of black label and the extremeness of Mountain Dew it provides for the ultimate bro experience.
"Hey bro! I just got done mountain biking and rock climbing so I'm going to relax with a Bro-Co."
Bro-Co by lumberjack joe October 15, 2007
Hey, I saw your Bro-co yesterday, he was hitting on your Sis-co. (Sister Cousin)
Bro-CO by heatherhay December 9, 2010
Deep convo between bros
Your sister in law lights u and your brother in law up and storms out of the room saying ," fuck you, you two can have your bro co but I'm fuckin outta here!"

Oh man! Matt fucked that chick! she gave me crabs. This is gonna be an awkward bro co.
bro co by midge nasty November 3, 2012

Co-Brother 

Brothers-in-Law related by marriage. Specifically men married to sisters related by blood, sisters of the same set of parents.

The usage signifies the ties of family or brotherhood via marriage, perhaps a reflection of the remains the matriarchal society prevalent in Southern India in pre-history.
Brandon is my co-brother, his wife Tammy is my wife's sister.
Co-Brother by Sunida February 22, 2011

step-co-brother-in-law 

My step-co-brother-in-law is a good person.
step-co-brother-in-law by Wonbig October 13, 2021