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1. Brosin
A half-brother who is also your cousin. The male offspring resulting when your sperm donor also impregnated your mom's sister. The male version of a couster.
I used to get along really well with my cousin Jake, until I found out we had the same dad. Now he's my brosin, and it's kinda awkward.
2. Brosin
A cousin who has the characteristics of a "bro"
My mother's nephew is such a brosin
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