It means people who talks too much useless things and being silly. It translated from chinglish, usually used after the phrase "you can you up".
A: I don't like you work. Someone else can do it so much better than you.
B: you can you up, no can no bb.
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If you can do it better then go and do it yourself, but if you can't do it then dont trash talk.
IF YOU CAN UP, NO CAN NO BB! :
You do the laundry yourself then!
But i dont know how!
Then IF YOU CAN UP, NO CAN NO BB!