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1.
Drunk to the point of staggering and passing out and being filthy dirty like a centrelink boong.
Example 1

Person one - Hey Browny we getting "boong drunk" tonight ?

Browny - "Oath mate"

Example 2

That dirty slut girl over there is "boong drunk".
by SweLL69 December 21, 2011
 
2.
The state of being as intoxicated as an indigenous Australian (boong, coon, abo, nigger) not long after cashing their fortnightly welfare cheque
Its Australia Day tomorrow, I wanna be boong-drunk by midday.

Hey Steve, look at that coon, he's boong-drunk and its only 10am, must be welfare day.
by reuby lou January 25, 2010