meaning of blow smoke up one's ass

blow smoke up one's ass meaning in Urban Dictionary

Tobacco Smoke Enema (1750's-1810s)The cigarette enema ended up being always infuse cigarette smoke into a clients anus for assorted medical functions, mainly the resuscitation of drowning victims. A rectal pipe placed into the rectum was linked to a fumigator and bellows that pushed the smoke to the anus. The heat associated with the smoke had been considered to promote respiration, but doubts towards credibility of cigarette enemas generated the most popular expression “Blow smoke cigarettes up one’s butt.”