"nonsense, rubbish," 1940, U.S. slang; originally 1920s army and college student slang for "venereal disease." Said to be a metathesis variant of
curd, which actually makes it an unconscious return to the original M.E. form of that word (see
curd). As G.I. name for "disease of any and every sort" it is attested from 1945.