Definitions by fartknocker101

Aunster 

A possible scenario of a relative whom is an aunt and a sister at the same time; when a woman has a child with a father and another with his son, or when a man produces children with a mother and a daughter, the aunster being the result of Subject A and the older generation (child with the mother or father) as related to the other child.

Ty: "How is Joelle your aunster?"

Jordan: "We have the same mother, but my Grandpa is her Dad."

Ty: "Dude, what the fuck!!??"

Aunster by fartknocker101 December 21, 2009

Couster 

One's sister and cousin at the same time: the result of either a man producing two children with a set of sisters, or a woman producing two children with a set of brothers, making the female offspring a couster to the other child.

"Carlie is my couster; we have the same Dad but our Moms are sisters. That is, like, so totally freaky!"

Couster by fartknocker101 December 14, 2009