How to say omg, wow, (Interjection) And they don't make any sense Can I know some of those words that are commonly used in China, especially among young people on social media?

Question

Answer

Oh, my God! (OMG) is used to express surprise, excitement, disbelief, etc. It is informal or is more of slang.

OMG! That bag is fabulous. 
or
OMG! You look amazing.

Other ways of saying OMG are: 
Holy Moly! (My favourie way of saying OMG)
Goodness Gracious Me!
Oh Gosh!

Answer

ummmm I think most of time we just directly say OMG and Wow huhhuh,that's quite common and universal.or you can try: 我的天哪。that's quite common also.

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