when your brother is also your uncle either because your mother had a child with your grandfather or your father had a child with your grandmother: the male offspring being your brother; because you share one parent, and also your uncle; because he is the child of your grandparent as well
Inbreeding term. Generally used as a pejorative against "chav" families that show a pronounced or characteristic genetic trait in their offspring.
You are the result of your mother and 'brunclespunk', because it can't be determined who your father is, other than it is either your older brother, or your mums brother!