1 B2 慣用的 カジュアル
笑いやドラマの効果を出すために、大げさに芝居がかって、派手で、わざと不自然に振る舞ったり演じたりすること。
"The pantomime villain really camped it up, and the audience loved every minute of it."
“
He camped it up outrageously, winking at the camera and swishing his cape.
— Commonly used phrasing in British theater/film reviews; representative of widespread critical usage in publications such as The Guardian and The Times.