look up any word, like donkey punch:
 
3.
When it comes to online-playing games, being a "coss" is the same as being a lying, cheating unhonorable bastard. Coss will not hezitate to do anything outside the rules to try and win whatever game he is playing, even if it involves the worst kinds of cheating available.
"Hey, i heard sleepy use fogscripts and cheat all the way?"
"Yeah what can you expect from coss"
by CheeseCovenant February 15, 2007
 
1.
A person who is sexually attracted to plants. A person who would rather go on a date with a pot of geraniums than with another human. Someone who is turned on by the physical qualties of certain plants. Used jokingly as an insult and/or swear word
Look at Megan flirting with that palm tree over there! Damn, that girl is such as coss!

Did you hear that Joe took a daffodil out to dinner last night? What a coss!
by Mayhem Institute August 16, 2011
 
2.
It is a word that can mean anything, and be used in ANYTHING, mainly used to piss people off, getting you and your mates to call them a coss and they get pissed off at you for not knowing what it is and you're secretly trolling them.
Bob:Wow stop being a coss, Nick.
John: Yeah Nick, stop cossing everywhere.
Gandhi: Wow Nick, you're so cossy sometimes.
Nick: HEY FUCK YOU WHAT DOES IT MEAN DICK?
Bob,John,Gandhi: LOLOLOLOLOL UMAD WOW YOUR SUCH A COSS
Nick: FUCK YOU!
by BahbJones October 21, 2013