MacOSXpert 

One who is skilled in the arts of the Macintosh operating system X.

Robyn is a MacOSXpert, She is very knowledgeable about the operating system she uses on a daily basis.

MacOSXpert by MacOSXpert August 8, 2011

Macxpert

someone who is well versed on Mac products, how they work, how to move around on them, etc.

if you can't figure out how to adjust your photo stream, why don't you ask a Macxpert.

Macxpert by anesthesiaherms September 3, 2013