Sibling 

A creature sent to earth to remind you that your parents are still having sex.

"Dude, congrats on your new sibling!"
"Man, don't remind me! All that means is my parents had sex at least 9 months ago."

Sibling by thedifinerofdefinitions January 12, 2015

Sibling 

A sibling is a dirty asswipe that gains its energy off making your life a hellhole. Your luck is especially unfortunate when you have multiple siblings within a small/medium average age gap
Siblings are there to 1) test your patience 2) ruin your life and 3) make you want to jump out your window, needless to say they also make you want to punch them in the face when you want to take a shower so they run in there first and lock the door when they weren't thinking about but only run in there because you say it.

You know when your family has lost the egg and sperm lottery when your siblings even go to the extent of counting out food so you both have the same exact amount.

"Hey bitch, it was unfortunate that you were the one who has to be my sibling. Stop being related to me. Thank you."

Sibling by You can go away now February 10, 2019

sibling 

A brother or sister.
A being with whom you share parents, whose sole purpose is to destroy your life.

In general, younger siblings are slightly more annoying than older ones, although in general older siblings are meaner and stronger so beat up the younger one.

sibling by Goldfish United! February 26, 2009

Sibling 

Hell in a human form. Unfortunately, they related to you.

My younger sibling drew a self portrait of himself. With lipstick. All over my algebra homework.

Sibling by Captain Lieutenant November 29, 2015

Sibling 

One's exact opposite, created by someone's parents to torture him/her until death.

Sibling rivalry is common among siblings.

Sibling by Ausie Badass December 7, 2003

Sibling 

A combination of a best friend and a punching bag

Tony is my sibling. He bugs the heck out of me, but I love him so much.

Sibling by Mystic_Snowfang July 2, 2008

Sibling 

The less commonly used term for brothers or sisters.

They are often identified with a loud voice and tattletale incidents. Pinching is their main defensive action.

Siblings are often called annoying by their older and smarter siblings.

"Mommy, he took my toy!"
"Don't be such a sibling!"

Sibling by TheEve December 6, 2011