rats

exclamation2

1. •
   (informal) An expression of annoyance or disgust; damn, darn.
2. •
   (informal) An expression of disbelief.

   • "It's damned clever — fair puzzles 'em every time. How d'ye get them?" "I tell you I don't. It's outside myself." "Rats! You can tell me, Tom. I'm Griffiths, the safe man." — 1925