fart in a mitten
n.— «Such terms would, understandably, have the Broadcasting Standards people “jumping about like a fart in a mitten,” in the phrase that [Reinhold] Aman cited in 1984.» —“Lingua Franca: One Hell Of An Insult…“ by David Rowan Guardian (London, England) June 5, 1993. (source: Double-Tongued Dictionary)