Related Clues:

• Mil. danger
• 'Well, look at that!'
• "So, that's it!"
• Nefarious piece of coding
• Palindromic exclamation of surprise
• Old-style "Good grief!"
• A mild expletive
• Last century's "Oh, my!"
• 'So that's your trick!'
• "Thunderation!" kin
• Oath finally made, go in search of pleasure
• 'Well, how about that!'
• ''The plot thickens!''
• Sherlock Hemlock's catchphrase on 'Sesame Street'
• Old oath, say: a “damn” originally?