Someone to blame when things backfire in someone else's life. There is actually no idiot brother, just like there is no boogeyman.
by Solid Mantis June 10, 2020

by Rileys69 October 17, 2017

by the don June 9, 2004

by MojojojoddsTU3 April 27, 2021

The NEW version of 'Your Mom!'. Because everyone knows that saying is getting old. So come up with something fresher like 'Your Unborn Brother!' It's totally random and will leave your friends confused and awestruck from you witty originality.
Q: What's the answer to #9?
A: Your Unborn Brother!
Or
Q: Who's the new choir teacher?
A: Your Unborn Brother!
A: Your Unborn Brother!
Or
Q: Who's the new choir teacher?
A: Your Unborn Brother!
by H Nicole M January 13, 2009

Someone who will always be there for you no matter the situation. Someone who could look up to you or you could look up to them. You will have a bond that no one could ever break.
by charc September 3, 2022

My co-brother-in-law is a good person.
by Elivaldeq November 24, 2019
