rah-rah       
adjective US informal uk/ˈrɑː.rɑː/ us/ˈrɑː.rɑː/
 拼命喝彩的
very enthusiastic, or showing or causing very enthusiastic support
  He was a man of action but not really a rah-rah type of guy.
 Mine is not a rah-rah faith that says God can solve any problem.
 Attracting rah-rah headlines is one thing: building a solid reputation is quite another. 吸引热烈叫好的头条新闻是一回事,建立可靠的声誉是另一回事。 
 - More examples
 - You can see the players tiring of the rah-rah stuff.
 - The can-do, feel-good, rah-rah exuberance that candidates sometimes bring to debates was in short supply.
 - He isn't a rah-rah guy in the clubhouse after a huge win.