THIS ONLY WORKS ON PTR AND BETA SERVERS!
Basically, all you have to do here is find a zone boundary (like from orgrimmar to durotar, stormwind to elwynn forest, Z zone to Y Zone, etc etc) and just keep quickly switching zones. If you have your character screen up, you should observe pretty much any secondary stats you have currently on your gear get readded every ~5 seconds!
Two major things about this though, any spells / auras that increase such said stacked stats (like a mastery proc trinket or a cooldown) will cause stats to reset. Stats also resets on zone change
Enjoy!