Possible Clues:

• "Dood, you blew my mind!"
• 'Whaaat!'
• Response of shock, in one spelling
• 'That's wild!,' in a modern spelling
• 'Mind. Blown.'
• 'Daaang!'
• 'Dang, that's impressive!'
• Exclamation of shock, spelled in a modern way
• 'Dang, that's cool'