"I just realized something important"

• "Mercy me!"
• "Heavens!"
• "Man alive!"
• "Holy smokes!"
• "No way!"
• "Heavens to Murgatroyd!"
• Dagwood exclamation
• Cry of panic
• Valley Girl exclamation

Wiktionary Word definitions in Wiktionary
interj. (eye dialect of oh my gosh English)