semi sibling

For children growing up in spilt families, When a parent remarries and has further children they are half brothers and sister.
When the parent who has left then has children the two young half siblings are unrelated. these are semi siblings.

Your parents first spouse's children. usually the half siblings of your half siblings.

My sister's Father's daughter is my semi sister.

My Brother's mother's son is me semi brother

They are both my semi siblings

by Toyotarox October 3, 2009

Middle Sibling

The forgotten being known to be made before the Younger Sibling and after the Older Sibling. this being is either to young or old to do things the the younger sibling or older sibling desire. yet many middle sibling are known to be depressed or forced to do the older sibling and younger sibling's chores.

Never forget the middle sibling

by BlainaCipher May 30, 2019

sibling hate sunday

Like man crush Monday or women crush Wednesday except for siblings, meant more as a joke because you should love your siblings, or just not hate them

Hey bro your my sibling hate Sunday (shs)

by Sam-nugget June 27, 2017

sible hedingham

A town full of legends and pimps

Welcome to sible hedingham

by God01787 January 10, 2018

sibleocratism

Used in twitch chat very often :)

sibleocratism is a word used in twitch chat

by YyeeyY October 2, 2018

sibilocratism

New word used by Twitch users on Asmongold's Twitch stream.

SIBILOCRATISM! See, I just made up a word. Twitch chat, start using that word!

by Archmagebob October 2, 2018

SIBILOCRATISM

The act of using Urban Dictionary as if it's a real dictionary. (Particularly used by balding streamers)

Asmongold's sibilocratism is almost as bad as his bald spot

by Dominotical October 2, 2018