Siblingcest 

Some fucked up shit Duncan came up with watching Mashle

That freak is into siblingcest

Siblingcest by 6789fghj June 16, 2025

cyber siblincest 

When two related cyborgs cultivate their cyberomance over the internet. They have long discussions over facebook chat, often after drunken parties, but when they see each other in real life, sentences are usually two words or less.

Sometimes they cannot recognise each other in real life unless fashioned akin to their profile photo.

Nat on internet: how come you went all narcoleptic on me last night... i was getting so close to it, i almost got you to tell me the whole reason for 'chad' (since you wont tell me sober)! How you feeling this morning anyway? Wanna cyber siblincest?

Nat in real life: sup.

cyber siblincest by chadlaw May 10, 2009

siblingist

To be unfair or bias against a certain sibling.

Your being siblingist against your brother/sister.

siblingist by lannan.7 October 15, 2019

Siblingist

To be unfair or bias against a certain sibling.

Your being siblingist against your brother.

Siblingist by lannan.7 October 15, 2019

siblingness 

When siblings share physical similarities. Similar to the word "lookalike" but specifically used to describe siblings.

"Very similar face, I can see the siblingness"

siblingness by aceofaces January 21, 2009