Siouster

means either your father had a female child with your mother's sister or your mother had a female child with your father's brother.

Stranger: How are you guys related to each other.
You: She is my Siouster.

by Sakurakage February 28, 2022

slouster

to kiss in a slobbery way.

I kissed her in a slobbery way, it was a slouster.

by Creamcookie;) April 26, 2014