literally, NIU BI=cow cunt(NIU DE BI, cow's cunt), so it's coarse language. NIU BI originated from CHUI NIU BI （course, not used in public or in writing), from CHUI NIU PI 吹牛皮( to inflate a cowskin raft; not taboo word originally), from KOUQI HENDA( literally, mouth air-stream very strong, KOUQI--manner of speaking, KOUQI HENDA--speak in a bragging manner)

牛逼 酷 炫 帅 爽 太棒了！ 太好了！ 。。。

Actually,'Niu bi（牛逼）' is not a very polite expression，but it's a colloquial way to say “awesone”.

you can say: 太棒了；真棒；太酷了；太牛了，etc I guess you want to say: niu bi （牛逼），this is okay, but if u want to sound more polite,that will not be a good choice.

棒极了！