Related Clues:

• Catch one's breath seeing end of long snake
• Texter's "Unbelievable!"
• Have trouble breathing -- that's when doctor's brought round
• What starts old Meldrew grumbling 'I don't believe it'?
• Breath of wind over top of prairie
• Breathe with difficulty when restrained by doctor
• Breathe with difficulty -- maybe oxygen pressure minimal?
• Talk quietly and breathe with difficulty
• For example, air pressure makes one catch one's breath
• 'Holy cow!,' in a text
• [Oh, my!]
• 'u r KIDDING!'
• [Good heavens!]
• Online "Wow!"
• Surprise letters