Christopher Ian Petrie, 23, faces charges of driving under the influence and driving without a license after police caught him on the makeshift vehicle, which was powered by a 50cc engine.
The incident took place on June 16 in Noosa on Queensland's Sunshine Coast, north of Brisbane.
Petrie's lawyers won an adjournment from magistrate John Parker as they sought to establish "whether a motorized esky [cooler box] was in fact a motor vehicle."
An amused Parker inquired with Petrie about his cooler box's performance.
"How much beer can it hold?" he asked the defendant. Petrie told the court the cooler box could hold "at least a couple of cartons."
He will re-appear in court August 16.