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2. sib
short for Suck It Bitch
bob: joe you're an idiot
joe: SIB
by mTk Jul 24, 2004 add a video
1. Sib
Short for sibling. Brother or sister, mostly for borthers.
Yo, Sib. Mom just said I'm her favorite
by daVirgo Jun 9, 2005 add a video
3. SIB
Short for "stuck-in-between". An acronym for a group of mature and attractive women who are younger than than the usual age limit for a MILF, yet old enough for proper recognition.

Typical age range for a SIB is between 25 and 29, but there have been reported SIB sightings in women as old as 32.
My friends and I decided to hit up this cougar bar looking for some older women, but instead the bar was filled with SIB's.

Dude, did you just see how hot that SIB was, she was perfect!

SIB Conversation (Actual):
Young Man: Hey girls, how old are you?

Attractive Busty Woman and friend: Ummm...26?

YM: Wow that's perfect, you guys are just what we were looking for, SIBs!
4. sib
Acronym for Still In Box
Often used in regards to makeup buying/selling.
This lip gloss is SIB.
bnib nib lnib bn ln
by Melodiee Apr 8, 2008 add a video
5. SIB
Self Injurious Behavior
That person just had a SIB when he punched himself.
6. SIB
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!"
7. sib
standard issue blonde
Driving around Brea, you would see plenty of sib's in their SUV's
by ChrisArmstrong Aug 21, 2005 add a video
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