Definitions by OWO777

Siblingnisum 

When your parents choose one sibling and is always on their side for everything. They can never do anything wrong. Think of it as sexism and racism

Mom: Tommy you are such a good boy

Me: What! I'm good too!
Mom:...
Me: This is complete siblingnisum

Siblingnisum by OWO777 November 10, 2021