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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Shoving a Banana, or a long yellow fruit, right up your rectal cavity, like a dildo or a hamster,or a gay man's DICK
"Jerry, I'd like you to shove Bananas Up My Ass"
by Badworder May 26, 2017
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To give someone a hard time or a lot of attitude.
I hate him! Every time he sees me, he tries to stick a shovel up my ass.
by House-elf December 9, 2010
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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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when youre up my ass for five nights
hjjfdknj : " fnuma "
gfwsdeth : " tf "
hjjfdknj : " five ngihts up my ass "
by bhsjdmbkxcvh September 30, 2021
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Similar to the phrase "Blowing smoke up my ass" but telling a person a lie to avoid telling the truth. This is especially done when caught in the wrong or other compromising positions.
"Jim caught his wife with another man at McDonalds; they were holding hands and everything!"
"Really, what happened?"
"Well she started trying to say the guy was just a friend"
"Seriously?"
"yep, I heard Jim kicked her ass to the curb, now she's staying with her 'friend' at his place."
"Man doesn't that beat all."
"Yes sir. I don't know how he's handling it so well... I would kill my wife if she was cheating on me, and then tried Blowing Air Up My Ass."
by wisemanoncesaid January 24, 2014
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