Sibkin 

A sibling of a sibling. Sibkins share no DNA but share a mutual brother or sister.

My little sister bought her brother a birthday present. No, I didn’t get him anything. I’m not related to him, he’s my sibkin.

Sibkin by Nellie knows best July 26, 2020

sibkin 

a combination of the words:

sibling, meaning a person who has the same parents as you.

kin: a suffix deriving from middle english, meaning someone relating to a common person/anscestor.

the combination of these two words makes sibkin, a word used to describe the children of one's siblings (aka, one's nieces and nephews).

Person 1: I went to visit my sister yesterday, my sibkin grew so much since the last time I saw them!

Person 2: Did you just make that word up?

sibkin by knowbdy May 27, 2024

Younger sibling

A little pest who likes to burst into your room while your doing homework, or playing on your phone. They like to hit you, then like a little bitch, they tell your parents when you hit back. In other words...they are annoying. They are so annoying they make you feel like banging your head against the wall so hard you lose all your brain cells.

You: *on your phone*

Younger sibling: *bursting into your room and runs up to you* Hey!

You: Go away.

Younger sibling: No! *Slaps*

You: *Slaps back*

Younger sibling: ....MOooOOoOoM *ugly sobs*

You: GODDAMNIT *bangs head against the wall*

Younger sibling by Crippled and depressed March 29, 2019

National Slap Your Sibling Day 

A national holiday where you can slap your siblings! It’s a wonderful day.

“Hey, sister.”
“Hey, what’s up”
“Happy national slap your sibling day!”
“Wha-“
*slaps*

National Slap Your Sibling Day by yourveryownmother October 28, 2020

Slap your sibling across their face day! 

On the 1st November, you can slap as little or as many of your siblings across their face

“Hey! It’s national slap your sibling across their face day!”

Slap your sibling across their face day! by Reetusthedinostomper October 26, 2019

Soul Sibling 

A friend who you are very close to and see and talk to almost everyday; it's as if they were your brother or sister; they are like family to you.

Your personalities match perfectly and you get along very well. You can tell them anything and they can tell you anything. Your souls are in sync.

Similar to brother from another mother or sister from another mister but no relatedness is implied.

1) Craig and Danielle are my soul siblings.
2) You see that guy over there, he is my soul sibling.

Soul Sibling by friendsfreak1989 November 6, 2010

Little sibling 

The most fucking annoying piece of shit that walked the face of the earth. Copy’s ur every fucking move.

You are playing COD and u die
Me FUCK
little sibling: FUCK
Then ur mum walks in and grounds u for a month for teaching sibling swears. You see little sibling gripping mums leg and sneering at u.

Little sibling by Maboiasznee November 21, 2019