What (who) is lung butter - definition

LIQUID SECRETED BY THE MUCOUS MEMBRANES OF MAMMALIANS

Phlem; Lung butter; Flegm; Phlegma; Flem

lung butter

The nastiness that you hack up in the morning shower after smoking a carton of cigarettes at the bars the night before.
Can also be used for productive cough.
I started coughing and ended up horking up a hell of a lot of lung butter.

farmer's lung

HYPERSENSITIVITY PNEUMONITIS

Farmer's Lung; Farmers’ lung

¦ noun informal term for aspergillosis.

Butter pecan

A FLAVOR POPULARLY USED IN CAKES, COOKIES AND ICE CREAM

Butter Pecan ice cream; Butter pecan ice cream; Butter Pecan

Butter pecan is a flavor, prominent especially in the United States, in ice cream, cakes, and cookies. Roasted pecans, butter, and vanilla flavor are used in butter pecan baked goods.

https://en.wikipedia.org/wiki/Butter_pecan

Wikipedia

Phlegm

Phlegm (; Ancient Greek: φλέγμᾰ, phlégma, "inflammation", "humour caused by heat") is mucus produced by the respiratory system, excluding that produced by the nasal passages. It often refers to respiratory mucus expelled by coughing, otherwise known as sputum. Phlegm, and mucus as a whole, is in essence a water-based gel consisting of glycoproteins, immunoglobulins, lipids and other substances. Its composition varies depending on climate, genetics, and state of the immune system. Its color can vary from transparent to pale or dark yellow and green, from light to dark brown, and even to dark grey depending on the constituents. The body naturally produces about 1 quart (about 1 litre) of phlegm every day to capture and clear substances in the air and bacteria from the nose and throat.

https://en.wikipedia.org/wiki/Phlegm