A snotty, unrealistic person that thinks his operating system (macintosh) is better than yours. Typically, mackeys are raised up thinking windows is a good operating system, then they get their hands on a mac and think their poop doesn't stink. They often make very homo-erotic statements about their desktop, webcams, and (or) virus invulnerability.
Synonyms: Homo, fago, poopo, dumb face, ass wipe, douche licker, poop smeller, mac fag, computer turd, turd turd, turd, turdey turd turd, and (or) poop turd.
Jake: Dudeeeeeeeeeee, my desktop is unbelievably organized!!!
Sean and Phil: Shut up you freakin mackey.
Jake: Dude, macs have sweet webcams so you can take millions of faggish photos of yourself kissing the screen and using peace signs while puckering your lips!!!
Sean and Phil: Shut the fuck up you douche licking mackey.
Jake: I like men and my anus is really loose from all the times I've thrusted my mac mouse up my anus. Also, macs don't get viruses.
Sean and Phil: God, that's such a mackey thing to say.