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It means change of subject. It is used more in the mediated communication genres such as texting, pming, iming, emailing, smsing, picture messaging, blogging, and ect...
Lisa Smith: Do these pants make my butt look fat?
John Smith: Hey babe, COS, we are going to be late if we don't leave right now!
by Ms. Busa November 16, 2009
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22
An abbreviation for cosines
Dude how I find X?
Just do cos 45
by TheOldDragon January 10, 2012
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23
Cup. Of. Sugar. A definition for a girl that is so hot that you would actually date her. You would go to her dorm/residence and make the excuse "i just needed to barrow a cup of sugar" because she is so hot.
Guy #1: Dude I went over to that cos's house today
Guy #2: really? she is so hot.. good for you
by rubydoo February 03, 2010
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24
The Zerg
Cant Organize Shit
Noob CareBear Alliance
Cos Zerged another city of 12 today

Cos is lead by an extremely flamboyant man named Herog.
by NB November 29, 2003
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25
a runescape clan, that likes to explore each others dungeons, also means "Council Of Saradomin"
person 1: dude, we went to war with you guys last night, you guys raped us! Cos: why, yes we did
by akwardsaw February 27, 2009
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26
Companies
Survey shows 38% of cos intend to hire job seekers.
by Dismemo July 28, 2021
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