MCOW 

Mystery Cock of the Week

A bonding ritual undertaken by fraternities in which a photograph of each member's penis is anonymously sent across a fraternity email list each week. The other frat brothers must then try to guess to whom the penis belongs.

Dude, is it gay that Delta Chi is starting a MCOW?

No, man. Its just brotherly love.

MCOW by whaaat617 September 29, 2010

McOw 

A response to pain dished out McDonald's style.

Ronald McDonald McSmashed Grimace in the McFace.
Grimace cried out "McOw!"

McOw by Bushwak December 15, 2008

Ownie McOwn 

An extremely 1337 CS player who has never been killed or outh4xed in his life. He is immortal in the internet gaming league known as Cal-i.

Tyler: OMG!! Guess who just wrecked on me hardcore?!

Me: Who?!?!

Tyler: OWNIE MCOWN!!

Me: NO SHIT. DID HE SIGN YOUR MOUSEPAD?!

Ownie McOwn by B money April 30, 2004

McOwned 

"McOwned" or "McOwn3d"
A version of "Owned" or "Own3d" referring to the picture of Ronald McDonald being arrested that has been circulated throughout many internet picture sites. It basically has the same use of "Ownage" except.... more creative.

OMG dood! You just got fucking McOwned!

McOwned bitch!

How about some fries to go with that McOwnage???

McOwned by bexposito October 17, 2005

McOwner 

1.One who McOwns usually at video games
2.One who beats up punks

1.I am a McOwner I just chainsawed like 10 people in 3 rounds on Gears
2.I McOwned Bryan cause he is a loser and smells like cheesy eggs

McOwner by Spencewin August 21, 2007

McOwn3d 

to get served, owned, prawned or told badly, ecpecialy in a matter similar to the arrest of Roanld Mcdonald, an accused arsenist

Dizamn, he got Mcown3d by the popo

McOwn3d by puss Puss the Maggot April 28, 2006

McOwned 

1.to get a good kill mainly on shooting games
2.to beat up a loser

1.me- u got mcowned
2.me- u got mcowned

McOwned by Spencewin August 21, 2007