Top definition
shorter way to say 'because.'
City are shite cos they've been relegated more times than Mark Roberts has gone out streaking.
by International Bad Boy September 04, 2004

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2
An abbreviation which stands for the trigonometric function, "cosine." In its native mathematical context, cosine is used in solving for side lengths or angle measurements in right-triangles, exclusively.
In regards to its place within the acronym: SOHCAHTOA, cosine occupies the "CAH," wherein the series forms: Cosine (equals) Adjacent (over) Hypotenuse.
When dealing with an angle measurement, x ("theta"), the side "touching" the angle is referred to as the Adjacent side; the side furthest away from the angle is referred to as the Opposite side; and, in a right triangle, the hypotenuse always remains and, simplistically, may be recognized as the diagonal side.

Note: UrbanDictionary entries do not support Entity, Hex or Decimal browser rendering. This definition of "cos" uses an "x" in place of the Greek small letter, "theta".
However, in reality, theta appears as an "o" or a "zero" with a line going horizontally through the center.
Math Problem: cos(x) = 0.5
Solution: cos(60) = 0.5
by HB <3 SA April 24, 2006

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3
Acronym for "Church of Scientology." Can also be written CO\$ since the "religion"'s main goal is to make money.

"The Church of Scientology is a vicious and dangerous cult that masquerades as a religion...It practices a variety of mind-control techniques on people lured into its midst to gain control over their money and their lives. Its aim is to take from them every penny that they have and can ever borrow and to also enslave them to further its wicked ends." -Operation Clambake
"Fuck, the COS took all my money and now I have none."
by r0semarysays July 19, 2006

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4
-simply means "cum on sight" when you see a hot girl in the mall. She is a C-O-S
Sexy girl walks by you and your boy..

Your boy: damn shes hot bro.
You: she belongs in the C-O-S hall of fame.
by yunglion12 July 30, 2011

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5
a term in persian for pussy
Your mom's cos is so hairy that it looks like a jungle.
by joe shmoe February 16, 2004

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6
Internet contraction of the English "because", often used in chat rooms or IM sessions in order maximize wordkeystroke conservation/word.
"I liek teh int4rnet cos it's kewl n shiz."
by brazenpuppy November 02, 2003

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7
abbrev. for Chill Out Slut; used when firing out the word "slut" is inappropriate, i.e. in a grocery store, courthouse, workplace, in front of children, etc. Encouragement for someone to relax, settle down, get out of your way, shut the hell up, etc.
Crazy bitch: "Did you hear about this and that and the other thing and this other thing and that person and what she did and he said and about what color underwear I'm wearing and what kind of weave do you have and where did you get that purse and did I tell you...."

Me: "OMG! COS! Seriously!
by COSsayer March 30, 2011

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