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1. A hybrid of the original Macintosh operating system and NextStep, based on Mach and FreeBSD and designed as the native system for recent-model Mac hardware.
2. Bad-ass rock-stable OS for people who actually want to get work done and don't want to screw around with drivers for 8000 different chipsets and security holes the size of the Ted Williams Tunnel.
3. Something PC zealots completely deny the existence of.
MacOS X by Brian X June 22, 2003
Related Words
Something that doesn't make your computer crash. HEAR THAT, PC USERS?
I'm typing this definition on a PC right now. Hopefully it won't cra–
::: Warning! Warning! An error has occurred! Please shut off your computer or your hard drive will be erased :::
Damn it! I know I should have gotten one of those new iMacs with OS X!
MacOS X by It's easy mm-kay! December 22, 2003
Apple's newest OS running on UNIX. The most stable OS ever, and has won several awards including Time magazine's Software of the Year. Something that makes PC users jealous and feel inferior, so they act like it is terrible.
I owned a PC for 3/4ths of my life, until i bought a Mac with MacOS X, and it has never crashed once.
MacOS X by cattle April 12, 2004
Yellow Dog Linux can't even hold a candle to MacOS X.
MacOS X by BSD fan October 31, 2003
GREATEST FUCKING OPORATING SYSTEM EVER!!! Makes Windows XP look like dogshit... OH WAIT, IT IS!!!
Oh look... I made a Final Cut Pro movie on MacOS X and just downloaded tons of programs in less than 5 minutes. Oh yeah... and my computer didn't crash once! Whats that you say? You say Windows can't do this stuff? Pity... :D
MacOS X by MMORGPEE October 24, 2005

mac os x 

BSD UNIX with an eye-candy interface, partly developed by Apple, Inc. The internals of the OS (i.e. the GNU Mach Kernel, the X-Windows System, the shells, the command-line binaries and scripts, etc.) were developed in part by the opensource community, whereas Apple, Inc. developed the high-level APIs and the GUI (both are proprietary).
Mac OS X is a good example of what can happen to any *NIX OS if given enough corporate sponsorship (or if it surrenders its licencing to a corporation).
mac os x by Judecn August 9, 2006