What is Pilkington's bon mot?

Pilkington's bon mot refers to a witty or clever remark made by Sir George Pilkington, a character in the play "The Last of Mrs. Cheyney" by Fred Thompson. This phrase captures the essence of a memorable quip that exemplifies Pilkington's character, showcasing his sharp wit and insight. The term has since been used to denote any clever or humorous saying in a similar vein.