Top Definition
Excessive cottonmouth due to the inhalation of the sweet sweet ganja.
"Dude, that last rip gave me hella butterlung."
by Devin H. September 30, 2005
When the smell of buttery popcorn is so overwhelming that it seems to attach itself to your nostrils, mouth, and lungs. The smell seems to float around like a gaseous poison. This occurs most often at run down discount movie theaters with poor ventilation.
"Open a window! That stale popcorn is giving me a case of butterlung."
by Rocko780 March 16, 2016
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