Related Clues:

• Incredible! (1)
• Thrill rider's inhalation
• 'Wow!,' in a chat room
• React to a shock, in a way
• Shocked letters
• 'r u kidding?!'
• "r u kidding?!"
• [I don't believe it!]
• [I'm frightened!]
• Catch a quick breath
• [I am shocked!]
• Texter's "Horrors!"
• Tough puff
• Blow hole round front of safe
• Struggle to breathe, so talk quietly