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1.
Shitty usage of ones lungs. After smoking mad amounts of spliffs, cigarettes, crack, etc. you may have a case of Bung Lung. Bung meaning shitty and Lung meaning lung, thus Bung Lung.
Adriano- "yo, all these bong hits are giving me Bung Lung"
Cameron- "Me too"
by Q-Teezy October 28, 2008
 
2.
The result of inhaling a fart. Not to be confused with the Cambodian city.
Dude, you farted so bad I got bung lung.
by cinamin rainbow November 02, 2010