Top definition
This is when your father has sex with your grandma and their baby is a hermaphrodite (both boy and girl parts)

Thus, this offspring would be both your brother and sister as well as your uncle and aunt all at the same time.

It is a brosisuncant (bro-sis-unk-ant)
What are you going to do mom now that your husband just made the family a brand new baby brosisuncant?
by Sp@deasp@ade May 28, 2018
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