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A tranny friend. Neither bro nor sis.
Tranny: sup bro
Male friend: sup brosis
Tranny: nm bro
A female who had gender reassignment surgery
Anne was my sister but now she's my brosis since she's had the surgery
Brosis by Stacie Sanchez March 12, 2023

brosis couple 

a couple that looks so similar that they are often mistaken for brother and sister.
person 1: wow, your friends look so alike, are they twins or just brother and sister?
person 2: neither, they're just a brosis couple.

person 1: ew.

person 2: i know, right? narcissism much?
brosis couple by i invented shizam September 15, 2010

Brosis Law 

The Brosis Law is like the bro code or the girl code. Although the Brosis Law is between a girl and a boy (bro sis). It includes keeping secrets, being the wingman/woman, and helping out in many situations. If someone dishonors the Brosis Law then they have been cursed to being alone for the rest of his/her life.
Nick: You can tell me who you like. I swear to never tell anybody on The Brosis Law.

Meghan: Wow. If you swear on that you can never go back. I guess I can tell you then.
Brosis Law by wildgurl28 March 7, 2015
a deep conversation (or heart to heart) where two or more individuals divulge secrets or life stories that are not known by many others. The heart to hears usually happen between, but are not limited to, two or more guys. The end result of these conversations is usually a newly formed bond, hysterical sobbing, a new outlook on life, or a homosexual relationship.
"hey, wanna brosesh tonight?" "yea man, i'll bring the tissues"
brosesh by bhuggers May 11, 2010

Bromiscuous 

The phenomenon of too many dudes hanging out at a social gathering, especially one in which alcohol is consumed in large quantities, without the presense of any chicks; drunk dudes at a sausagefest who start to blurr the lines between just being a "bro" and taking it a borderline homosexual level that starts to get weird
Mark: Dude, were you at Joe's party last weekend?

Neil: Yeah man. It was just Joe and all his weird friends from high school. They were starting to get a little bromiscuous man.

Mark: Like what?

Neil: It started out with some beer pong victory dance they were doing... and then Garrett licked Joe's nipple

Mark: ... thats pretty bromiscuous
Bromiscuous by PatchesMcBalls December 11, 2010