To Blow Smoke Up One's Ass

1750's to 1810's Tabacco Smoke Enema Kit
Doctors would insert the tube into a drowning person's anus and pump tabacco smoke into the rectum to revive said person.
It was thought that warm smoke blown up the bunghole would induce breathing.

Lets just say anything shoved up my ass would make me gasp for air!

So there you have it, the term to blow smoke up one's ass!

And remember.....
Laissez les bon temps rouler!
And as always, thanks for listening!