酷 usually is the frequently used phrase to describe "cool" in Mandarin, and I guess you can use when you want to say awesome. BTW, you can also use 赞 which is not so often used as 酷
2014年10月1日
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There's a very fashionable word that can describes it. 拉风。So you could say 他/她很拉风. Personally, I really like it