My regularly acerbic major

• Credit one with essential goodness
• "Holy smokes!"
• "Bummer, bloke!"
• "Holy smokes, mate!"
• Cor blimey!
• "Holy cow!"
• Steve Irwin catchphrase
• Good Lord!

Wiktionary Word definitions in Wiktionary
interj. Used as an exclamation of astonishment, or as an emphasis of fact at the conclusion of a statement.

Douglas Harper's Etymology Dictionary Word definitions in Douglas Harper's Etymology Dictionary
exclamation, 1838, probably one of the many substitutions for Christ .