The phrase is kind of awkward to translate into Chinese (especially with my limited ability in the language), but I'll do my best:
Oh: I can't really find a character for "Oh," which I would say "Whah!" Imagine Keanu Reaves saying a drawn-out "Whoa" but with the a vowel instead, and you got the general pronunciation.
My: "My" is a combination of two words, the all-purpose, first-Person pronoun "Wo" (pronounced somewhere between "Wuh" and "Wo") and the article "De" (pronounced like a really short "Duh").
Joss: This is a weird one. I'm not sure if I'm correct at all, but a long time ago, someone told me that this character is sometimes pronounced "Joss." It means luck/fortune. The person who told me that may be mistaken, and you should take my opinion with a grain of salt, too; because my parents like to label me as a "wai guo ren" (meaning "foreigner" a.k.a. not
It's: This is basically the verb "to be." The "it" is implied.
God: I'm not sure about this one--I looked it up on http://zhongwen.com/
, and there were two potential characters for it. I recognized that this one is a combination of two characters for "person" and "mountain," so based on my limited knowledge of these combination choices, it indicates some persona/personification/entity. Of course, I could have just stumbled upon the Chinese Character for "CROM
"--like I said, I is a foreigner.