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2.
short for cyan, magenta, yellow, and key (black)

it is also a webcomic made by Andrew Joseph Koenig. (who is a super duper awesome fellow. all praise to him)
until he gets a site, you can check it out here
http://icepyro-aj.deviantart.com/gallery/
guy 1: yo dude, you check out the new CMYK comic yet?
guy 2: no lol, what's it about?
guy 1: roflmaolololol can't explain, just check it.
by Icepyro December 07, 2008
 
1.
Cyan, Magenta, Yellow, blacK. The colors used to make color printouts from either inkjet or laser printers.
It sucks that I have a CMYK cartridge, instead of individual ink tanks like Canon has.
by Val-Dogg February 05, 2004