An acronym for a Spooning Induced Boner. A common malady for young, male, virgins. A side effect for the receiver is a minor bruise in the thigh/hip region. This will hurt for 4-7 days minimum, depending on the size of the offending boner.
"Oh man, I have a bruise the size of a quarter on my buttocks! What can it be from?!"
"OOOOOhh that's from a SIB!"
"OOOOOhh that's from a SIB!"
by AMAHAHA August 5, 2008

eg 1.
Girl eating ice-cream
Guy: "Bro, you're doing a Sibs"
Girl: "GAH stop watching me eat" *walks away and hides"
eg 2.
Guy watching Girl brush her teeth.
Girl: *stops* "What?"
Guy: "Wow Sibs, you even brush your teeth sexually."
Girl: *hides in shower*
Girl eating ice-cream
Guy: "Bro, you're doing a Sibs"
Girl: "GAH stop watching me eat" *walks away and hides"
eg 2.
Guy watching Girl brush her teeth.
Girl: *stops* "What?"
Guy: "Wow Sibs, you even brush your teeth sexually."
Girl: *hides in shower*
by PancakesANDBrownies June 20, 2009

See that irish fella over there, spitting at women off of Blind Date? Bet he's SIB, ask Richard Whitely'
by Derby_Girls January 6, 2004

by hoyasaxa19 February 28, 2014

by unknown 1337hax0r October 19, 2004

Taken from the words sibling and sabatical; occurs when two siblings take a break from communicating with each other because of too much time spent together or because typical sibling turmoil is wearing them out.
I'm so tired of my sister's whining and complaining about all of her personal issues. I love her, but we seriously need a sib sab for a few weeks.
by Indy Sparkplug May 13, 2010

When you tell your sibling to ask your parents for something you want and you hear them use your name.
"Tyler go ask mom for Mcdonalds"
"Ok"
*goes to mother*
"Mom, Ashley wants Mcdonald's"
*goes back to Ashley*
"Dude! you totally Sib-Snitched!
"Ok"
*goes to mother*
"Mom, Ashley wants Mcdonald's"
*goes back to Ashley*
"Dude! you totally Sib-Snitched!
by Jazz J June 17, 2016
