Somebody who thinks that having the latest technological gadget or operating system from Apple Inc. is the most important thing to be concerned about in the world.
You will usually find them wearing black turtlenecks or other casual clothing in a coffee-shop with an Ipod in their ear, surfing the web on their i-phone, or whatever brand of apple laptop they currently spent too much money on.
They generally enjoy bashing anything that has to do with any other operating system and will get infuriated if you talk fondly about Bill Gates.
Some of these mac-geeks are rumored to actually worship Steve Jobs or get tattos of the Apple logo on their body. I kid you not.
"Dude, did you see that total mac-geek walking down the street listening to their ipod and sippin that starbucks?