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A person who makes a fool of himself all the time, and likes to eat stuff off the floor, and is over 6 foot.
"Eww, stop licking that yoghurt off the floor you Macass
by Darryl Harris 11B November 01, 2005
1. One who gets very agitated when a software product is out for PC but not Mac.

2. A person who will go on and on about how much better Apple products are, even when unsolicited.
Some macass is threatening to sue us because we don't make a version compatible to Mac!

I can't check my phone without that macass going on about how much better Apple is!
by TalkinNerdy May 15, 2013