Green’s Dictionary of Slang

McGarrett n.

[the fictional detective police Lieut. ‘Steve McGarratt’ in the TV crime seriies Hawaii 5-0]

(Aus.) a $50.00 note.

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[Aus]T. Peacock More You Bet 67: The ‘$50 note’ is sometimes referred to as a ‘McGarrett’, after the character in the television series, Hawaii Five-0 .