what do -다가/-하다가 means?
I used to hear korean people say these -다가/-하다가 but i dont know exactly what theyre talking about :-(

Question

Answer

This is a big complicated.  It's what they call "transferrative".  Not exactly "while".  It means while you are doing something, you transfer to do a different thing.   "he was swimming, then got a cramp".  it means while he was swimming, he stopped and transferred to something else, in this case getting a cramp.  This grammar is always a bit complicated, probably takes more listening practice to get a hold of it.

Answer

-하다가
when i'm doing something

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