Through and through, or thoroughly believing in or supporting something or someone ('a dinky die supporter'). An authentically Australian item or person.

To be 'dinky die' is usually referring to being very Australian or behaving in a very Australian manner, or to be authentically Australian made.

Usually referred to as a 'dinky-die true-blue dead-set legend' just to use in conjunction with other Australian turns of phrase. A slightly more respectable turn of phrase than being ocker
"he's as dinky die as you get"

"If its Australian, its dinky die!'
by selvero September 16, 2009
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