2 definitions by Kassy Kas

A younger sibling who displays characteristics that the oldest should possess.
I'm the youngest of my siblings, but more mature. I'm a big-little sibling.
by Kassy Kas September 10, 2022
Get the Big-little sibling mug.
An older sibling who spends money on their younger siblings without making them pay it back.
My sugar sibling just got a new job and makes eighty-grand a year. I'm going to be spending it like it's mine. They're my sugar sibling.
by Kassy Kas September 9, 2022
Get the Sugar Sibling mug.