"Drat!" (6)
(Other definitions for crud that I've seen before include "That's disgusting" , "Disgustingly foul substance" , "Disgusting waste matter" , "worthless stuff" , "Unpleasant substance" .)
(Other definitions for darn that I've seen before include "Stitch" , "Mend (knitted material)" , "Repair (with needle)" , "Mend with a needle" , "Mend with 17s - mild expletive" .)
(Other definitions for heck that I've seen before include "Damn" , "grating!" .)
(Other definitions for curses that I've seen before include "Oaths and imprecations" , "Blasphemes" .)
(Another definition for phooey that I've seen is " indication of contempt".)