Smokestacking 

To blow smoke up one's ass. To lie. To tell a fib.

"Dude, I totally had sex with three girls last night."
"Man, stop smokestacking!"

Smokestacking by ConsuelaTriForce May 9, 2014

Smokestacking 

To vape on top of a car or truck.

“Dude, we’re going to go smokestacking in the Walmart parking lot.”

“My dad bought me the wrong mustang so I’m gonna smokestack on it till the roof breaks.”

Smokestacking by nacpalm September 27, 2019