hot under the collar

adjective2

1. •
   Angry; agitated.

   • "Oh, cut it," said Steve wearily. " . . . I don't want to listen to drivel like that." "Drivel?" repeated the other, puzzled. " . . . I don't see why you need to get so hot under the collar. — 1914
2. •
   (informal, slang) Sexually aroused.