Sidling 

1. A name for a younger sibling
2. A small person named Sid

Have you met Sid? my younger brother? They are such a sidling.

Sidling by Mymylele January 7, 2021

sidling 

To move in a unobtrusive, sideways action.

"Mandy," I whispered sidling up to her.

sidling by Morgan T. May 11, 2006

Sidling 

To dominate a woman sexually. Often to have caused pain with the extraordinary legnth of the penis.

Danny: He has only just met her, that is incredible.

Aaron: I love that guy, he is definitely going to to be sidling her tonight.

Sidling by 24jynnad April 3, 2009

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