frat boy
noun [ C ] US informal often disapproving uk/ˈfræt ˌbɔɪ/ us/ˈfræt ˌbɔɪ/
（吵闹无聊的）男大学生联谊会成员
a young man who belongs to a college fraternity, and who behaves in the noisy or silly way that is thought to be typical of fraternity members
He had been out drinking with the frat boys. 他和一些吵闹无聊的联谊会男孩一起外出喝酒。