Green’s Dictionary of Slang

Hogan’s ghost! excl.

[? an unknown anecdote]

(Aus.) a general expression of amazement.

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[Aus]Sydney Sportsman (Surry Hills, NSW) 30 Jan. 1/2: Even the army of spitters [...] ejaculated, ‘Hogan’s ghost, that is strong’.
[Aus] Home and Away (TV show: Seven Network) 🌐 Alf Stewart Charisma/Lingo Hogan’s Ghost: Use in shock. eg ‘Hogan’s Ghost!’.