"Aw, rats" (4)
(Other definitions for drat that I've seen before include "Curse it!" , "Blow!" , "Darn it!" , "Exclamation of annoyance" , "Bother" .)
(Other definitions for crud that I've seen before include "radioactive waste" , "worthless stuff" , "That's disgusting" , "Unpleasant substance" , "Disgustingly foul substance" .)