We all know the Luftwaffe had no official nose art, though several airplanes carried personalised nose art design. Many others had the official Geschwader emblem + sometimes a little extra. Hahn is a famous Ace which could be easily recognised But other crews sometimes had their own design... The translation could be Pants bullshitter or pants buzzer (brummer means buzzer/hummer but also bullshitter . Sowas dummes = so stupid .