Bashi-bazouk

A bashi-bazouk (in Turkish başıbozuk, meaning leaderless) was an irregular mounted mercenary soldier of the Ottoman army. The bashi-bazouk were notorious for being brutal and indisciplined. They were recruited from homeless, vagrants, criminals, slaves and prisoners of war. Foreign mercenaries and volunteers could also be hired to the corps.

In Hergé's Tintin comic book series, a character named Captain Haddock uses this term to show his frustration with something.