To joke, to tease in a familiar way

bỡn mấy câu

to tell a few familiar jokes

nói bỡn mà hoá thật

things thought to be said in joke turned out to be said in earnest

dễ như bỡn

easy as a joke, easy as a childs play

việc quan trọng chứ không phải chuyện bỡn

it is an important matter and no joke