Zarathustra was a Persian-Medean priest.
Supposedly was the first uberhuman, as mentioned in Friedrich Nietzsche's publications.
"Oh My Zarathustra" is an augmentative variation of OMG/ "Oh My God". It expresses severe rage, surprise or painful butthurt.
The expression is commonly used amongst late-twen over achievers, it recently appeared in rural south german suburbs, cities and trains.
It has also occured in Singapore's caucasian immigrant culture, though in unsignificant, vanishing frequency
OMZ she ugly.
OMZ I've lost everythin'.
OMZ I think I'm losing my mind.
OMZ I will destroy you.