When you are a brother and a cousin at the same time.
Us two are brothers , them two are brothers but us two to them two our BROusin. Because we're brothers and were cousin's.

Example:
A woman who conceived a child by one man & a child by another whom are cousin to each other would then call those children brousins. Because they brothers & and cousin's at the same time.
by GambinoBaby602 April 12, 2022
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WHEN YOUR FATHER MARRIES YOUR AUNT WHO ALSO HAS A SON.
HE USED TO BE MY COUSIN... BUT NOW HE'S MY BROUSIN.
by bored rrt's February 19, 2011
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The above definitions are correct, but I'll also add that brousinhood can occur without some weird babymaking with two women who are also siblings. Another instance of brousinhood is when a family adopts their niece or nephew, later having kids of their own, making the adopted child and the newborn baby both brothers and cousins.
Stranger: Eminem, are your kids sisters or cousins?

Eminem: Well I adopted one from my ex-wife's sister, so I guess that makes them brousins...
by explicittt39 August 18, 2011
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When a boy in your brother and cousin because you have the same daddy and your mommas are sisters
Hey,the my brousin
by Hoe64thebotch October 22, 2018
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My brother is also my cousin.
My brother is also my cousin. That makes him my brousin (bra-zin)
by Lirpa Mosnar December 12, 2021
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