~ sb/sthif an animal butts sb/sth, it hits them or it hard with its horns and head （动物）用头（或角）顶
noun
a pain in the ˈneck (BrE also a pain in the ˈarse/ˈbackside) (NAmE also a pain in the ˈass/ˈbutt)
(informal) a person or thing that is very annoying 极讨厌的人（或事物）