Related Clues:

• Spitting nails, so to speak
• Really peeved
• Boiling over
• Very cross
• Really miffed
• Mighty mad
• About to go through the roof
• Ready to blow one's top
• More than mad
• As mad as a wet hen
• With feathers ruffled
• Really 16-Down
• Feeling furious
• Angry and then some
• Foaming at the mouth, so to speak