sib
Acronym for "sweaty itchy butt" usually caused by inadequate wiping after a B.M., or lack of shower after defecating.
My buttcheeks are sticking together due to this horrible case of sib.
by Robert Seigel November 18, 2008

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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.
by Pahey12345 June 12, 2011

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A Sibs is the act of doing EVERYTHING sexually
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*
by PancakesANDBrownies June 20, 2009

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Members of the Sigma Iota Beta local sorority at Hope College. Every girl on campus wants to be a SIB but would deny it if asked. They like to party and have a good time but are also the girls you could take home to mom and dad. They are the most down to earth and involved on campus. If you meet a cool girl at Hope, odds are...she's a SIB.
Guy 1: I met these sweet girlslast night. They were hot, fun, and smart.
Guy 2: Were they SIBS?
Guy 1: Yeah
Guy 2: knew it
by John Crimes August 21, 2011

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SIB
Someone who is well known for being 'Shit In Bed.'
See that irish fella over there, spitting at women off of Blind Date? Bet he's SIB, ask Richard Whitely'
by Derby_Girls January 06, 2004

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Acronym for suck it bitches. Usually used to dis ones friends when having ones intelligence made fun of.
Nick: Aaron, are you sure you have enough wit to perform that action.

Group: *Laughs*

Aaron: SIBS
by Dpie May 30, 2006

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sib
SiB = 1337 hax0r, pwn joo

pwn rellik mostly...
Hey i heard SiB pwned Rellik 10-0 at Call of Duty, omg SiB is such a 31337
by unknown 1337hax0r October 19, 2004

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