to bullshit or lie, to tell a falsehood. originally comes from the era of snake-oil salesmen and traveling hucksters pandering cure-all ointments.

one said cure for many ailments (including constipation) was a "tobacco enema" in which the purveyor would literally blow smoke up the afflicted's rectum with a device created solely for this purpose. obviously people caught on soon enough, and figured out that tobacco enemas were embarrassing as well as useless.

as such, the phrase became the euphemism it is today for selling a line of nonsense to an otherwise naive or unsuspecting rube.
person 1: "did you know that recent studies show that rat feces are as effective as any available wrinkle cream on the market?"

person 2: "you're totally blowing smoke up my ass"
by waterbrother September 11, 2009
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To purposely tell someone what they want to hear but also giving yourself excuses and reassuring someone that what is happening is neither their or your fault.
Teacher 1: Jack told me that he can't take the test tomorrow because he has been really busy even though according to him he thought I did a great job explaining it to him. I think I'm gonna give him an extra week.
Teacher2: Oh please, he's just blowing smoke up your ass
by thickjordanianbooty101 June 2, 2020
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Tobacco Smoke Enema (1750's-1810s)
The tobacco enema was used to infuse tobacco smoke into a patients rectum for various medical purposes, primarily the resuscitation of drowning victims. A rectal tube inserted into the anus was connected to a fumigator and bellows that forced the smoke towards the rectum. The warmth of the smoke was thought to promote respiration, but doubts about the credibility of tobacco enemas led to the popular phrase “Blow smoke up one’s ass.”
I don't trust him, he's just trying to "blow smoke up one's ass".
Oh don't believe him, he's just blowing smoke up your ass!
by Chafu August 19, 2009
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When someone is putting you on, or being a kiss-ass.
"Gurl, no offense, but Dabreesha was totally blowing smoke up your snatch when she told you that dress looked good on you."
by Acerrico July 22, 2008
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Most literally translating to "trying to get a reaction" out of somebody. Originated from a 16th century technique to determine death by literally blowing tobacco smoke into someone's anus (through a long pipe) - where a reaction indicated that the person was still alive.
Guy 1: Hey man, I think someone just stole your car!
Guy 2: Are you blowing smoke up my ass?
by Med Student November 30, 2005
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letting a friend or someone smoke your weed with you for free
Milo - "heyyy man got any money for bud?"
Jenner- "nahh man"
Milo-"thats okay, i'll smoke you up"
by powerranja April 4, 2009
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means to share your weed with someone and get them high for free.
Hey NG!so you gonna smoke me up tonight or what?
by Angela aka NG November 29, 2006
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