Related Clues:

• 'Yowza!'
• Surprise big-time
• Impress-plus
• Greatly surprise
• Oohing cause
• Zap with a Taser
• Something to stand in
• Gape producer
• Really grab
• Strike with surprise
• Ship greeters' look in Close Encounters of the Third Kind
• Humbling feeling
• Render unconscious
• Exclamation of amazement
• Great reverence