The Resident Judge of Port Phillip has never done the Tim Tam slam. I didn't know it had a name. Perhaps it is different. My recipe is not the same as that featured on her website.
Have a couple of spirit drinks, not too much dilution mind.
Make strong long black coffee from freshly ground beans. Suck up some black coffee through Tim Tam.
Chuck Tim Tam away over shoulder. Pour and drink another strong spirit and take another Tim Tam.
Suck up more black coffee. Feed Tim Tam to nearby child.
Pour and drink another glass of strong spirit. Suck up remainder of coffee through Tim Tam.
Feed left over Tim Tams to nearby dog. Pour yourself another drink and toast yourself in approval at your celebration of Australian culture.