Whenever someone else blows smoke in your face, whether it be cigarette smoke, smoke from a bong, or even steam from a vape.

Lung ass is a derivative from smoking joints, where the tail end is called an ass.
Person 1: "Hey smoke this" *Blows smoke in person 2's face*
Person 2: "Man i don't want your lung ass!"
by Woodzman December 5, 2020
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