1. To blow smoke up someone’s ass means to insincerely compliment someone to get something from them or get them to do something.
2. To manipulate someone with flattery; to exaggerate about something in order to make it seem better than it is. 1Pare, May. Body Idioms and More: For Learners of English. United States?: Mayuree Pare, 2005.
English speakers often use this idiom in the negative, i.e., “Don’t blow smoke up my ass.”
Compare to Blow Smoke.
Sentence Examples For Blow Smoke Up Someone’s Ass
“Don’t listen to the salesmen around here. They’ll blow smoke up your ass for an hour to try to get you to buy a car.”
“Don’t blow smoke up my ass,” said Vance. “I know you just want me to let you borrow my car.”
“My editor told me I deserve a Pulitzer for my latest article. I hope he wasn’t just blowing smoke up my ass.”
“She didn’t really like your present. She was just blowing smoke up your ass.”
“I know I’m not the best singer in the world, so stop blowing smoke up my ass and just give me some honest feedback.”
“The recruiters will blow smoke up your ass about the ‘company culture’ just to get you to sign the contract.”
“He spent the entire date blowing smoke up her ass about how brilliant her thesis was, but it was clear he hadn’t even read the abstract.”
Origin
Many sources claim that this idiom came from an actual medical practice. During the late-1700s, doctors would literally blow smoke up the rectums of those thought to be dead, especially drowning victims, in the belief that this would resuscitate them. Doctors used a bellows attached to a fumigator or a syringe filled with tobacco smoke to perform these “tobacco enemas.” During the late 1700s, the Royal Humane Society actually installed resuscitation kits along the River Thames that included bellows specifically for this procedure.
While tobacco smoke has a long history in folk and tribal medicine, this practice seems to have been an offshoot of enemas or ‘glysters’ of liquid tobacco preparations. Tobacco was thought to be a stimulant, and thus a solution of tobacco, given as an enema, was used to treat all sorts of diseases, including common colds and cholera as well as to revive patients.
Presumably, using tobacco smoke instead was a last-ditch effort when a liquid enema was not possible. Later, when scientists found that nicotine was a cardiac toxin, this practice died out. 2Morris, Thomas. Mystery of the Exploding Teeth: And Other Curiosities from the History of Medicine. Penguin Publishing Group, 2018.,3Pare, May. Body Idioms and More: For Learners of English. United States?: Mayuree Pare, 2005.
The Source of Blow Smoke Up Someone’s Ass
However, though this bit of bizarre medical history appears to be true, its association with the present idiom is dubious, as the medical practice died out long before this idiom first appeared in English, sometime during the 1940s. It is unlikely this long-ago medical practice could have inspired the idiom at so late a date. It is more likely that this is an offshoot of the idiom to blow smoke, meaning to mislead or deceive, with the reference to one’s derriere meant to add color. Although other explanations have been offered, most of them seem to be blowing smoke!