fart in a mitten
n.— «To run around like a “fart in a mitten” is descriptive of the sort of frenzied rushing of a puppy or small child. It has to be the ultimate mismatch of words, the origin of which is absolutely shrouded in the mists of total obscurity. But mother, nonetheless, accused me of it.» —by George B. Higgins, Greg O’Brien How to Speak Like a Cape Codder: An Old Salt’s Dictionary Dec., 2003. (source: Double-Tongued Dictionary)