故意装扮成很酷的样子to try to be cool

• 她偏偏爱扮男生装酷，专找男生聊天。

  Unfortunately, she likes to dress up as a boy and try to look cool, trying to find boys to chat with.

• 其实李铁从来不会笑，不是装酷。

  Actually, Li Tie was never one to smile – he is not trying to be cool.