Top Definition
The disturbingly nasty sound that comes from a smoker's lungs when they laugh hard. It often sounds like paper shredding or a pipe suddenly being unclogged. It is most commonly heard in smokers over the age of 40. A typical flem soaked smoker's cough usually follows.
Kelly: "Where did Aunt Debra go?"
Kim: "I think she went outside to smoke."
Kelly: "Why does she eat healthy and drink green tea while smoking two packs a day? She even has the lung butter laugh."
by SirJigglesAlot January 27, 2011
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