DISCLAIMER: I don't speak Korean, so these translations might be (a bit) off, but they should be right when translated freely.
PART 2: http://youtu.be/s7HSzkoF6YQ
Everytime MAMAMOO performs Um Oh Ah Yeh, they have this part in the bridge where they alter the lyrics, the adlibs. Because it's different everytime, it might be hard to understand. Here are some english subs for the best adlibs they did so far!
Don't worry, MAMAMOO is a group I totally stan so if I made any mistakes, just tell me - it's greatly appreciated.
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COMMENT if you have any ideas. I'll look into most of them, promise!
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CREDITS:
Some really nice people of /r/korean (Courage!)
Comments on live performances
My very lacking Korean knowledge