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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!
cos by Ms. Busa November 17, 2009
It means the passing of stool. Its origin is derived from Bill Cosby.
"Yo man I gotta drop a cos!"
cos by HFC Tru September 20, 2007
It’s an acronym for “Chip of Shit” aka Shit Chip
When I got closer I realized he was playing with a COS..
COS by Cake.Slaughter November 14, 2022
Like Dawg, another attempt by black street thugs to address one another.
Yo cos, whereyou be hidin da crack?
cos by Moe Foe March 30, 2005
An abbreviation for cosines
Dude how I find X?
Just do cos 45
Cos by TheOldDragon January 11, 2012