SIB 

Shy in Bed.

Sorry, I can't use that position, I'm SIB

SIB by River Carr May 7, 2010

Sib 

Self Improvement binge

I was going out to the old port too much, but then got tired of being pathetic, so I started a sib.

Sib by Pahey12345 December 11, 2011

SIB 

Sorry I'm Busy

A great excuse; A great acronym; A great way of life

Chicken: Hey Duck wanna ****?
Duck: SIB with your mum.

SIB by TaiLopez'sBookshelf July 26, 2016

SIB 

Acronym for "Should I buy"

Used in forums like Reddit as a subject header to ask what is mentioned in the body of the message is worth buying.

SIB Magic Bullet blender/food processor?

Yes, you should buy it, its very handy and useful, without taking up much space.

SIB by Ulfsark July 1, 2017

Sib 

Sib is a very Big Mac fatty, she likes to eat 5 hungry jacks bqq cheese burgers an hour and complain that Indian food smells like Indians, she also likes soggy biscuits and many other soggy things

I’m hungry lets all be a sib

Sib by Sib July 3, 2018

sib 

You could call your friend sis or bro, but what about sib? It’s rEvOlUtIoNaRy!
bro= brother
sis= sister
sib= sibling
It’s great for ur non-binary pals

a: I just got a sugar daddy
b: Yesss, get it sib!

sib by iamitSIB December 24, 2019

Sib 

Gender-inclusive term of endearment used among anyone who loves someone else in whatever capacity (platonic, familial, romantic, etc.). An alternative to "bro" or "sis".

Person A: Hey... *thinks* wait I don't know their pronouns *thinks* sib, what's up?
Person B: The sky lmaooo :P

Sib by I Am Princess X June 20, 2020