This phrase is used to intensify the meaning of verbs such as bore or charm or kid or scare or talk . For example, That speech bored the pants off us, or It was a real tornado and scared the pants off me. Playwright Eugene O'Neill used it in Ah, Wilderness! (1933): "I tell you, you scared the pants off him," and Evelyn Waugh, in A Handful of Dust (1934), had a variation, "She bores my pants off." [Colloquial; early 1900s] Also see bore to death; beat the pants off.