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
Person B: The sky lmaooo :P
by I Am Princess X June 20, 2020
Get the Sibmug. Short for self injurious behavior. Similar to sh (self-harm) except sib is doing something that hurts themselves, but isn't meant to inflict harm. But sh is trying to inflict harm on themselves.
Me: when I was younger I used to sib
Person: what's that?
Me: something I did to hurt myself but I didn't mean to
Person: isn't that sh?
Me: no I didn't do that until later in life, my sib was hitting my head when I didn't get my way
Person: what's that?
Me: something I did to hurt myself but I didn't mean to
Person: isn't that sh?
Me: no I didn't do that until later in life, my sib was hitting my head when I didn't get my way
by That_Trans_Guy_Denki May 18, 2022
Get the Sibmug. by Luna :3 January 22, 2022
Get the Sibmug. 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
by Sib July 3, 2018
Get the Sibmug. Sib is another word for sibling
by Purr vanilla cookie October 20, 2021
Get the Sibmug. 
by Pahey12345 December 11, 2011
Get the Sibmug.