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The measurement of a bongs full capacity reaching the top of the neck but does not include smoke inhaled. Usually used in the context of bong that needs to be cleared or when newbies need others to milk it for them.

commonly shortened to "stack"
ex.1
"She cleared like 3 stacks out of my straight shot.."

ex.2
I don't wanna finish that stale smoke stack!
by KHANO June 22, 2011
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2
Guy 1: Josh totally smokestacked her.
Guy 2: Wow that sounds dangerous
by Ocooto July 23, 2017
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4
When ones butt cheaks are tightly pressed and flatulance is released. The resulting crevace functions as a vent upward for the rising flatulance.
"I was sittin in class and I couldn't squeeze this monster fart out, I just had to pull the old smoke stack."
by Neil Love May 16, 2005
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5
A sexual act in which the participating female rips a fat bong, holds in the smoke, and performs oral sex while the smoke pours out of her mouth. In some cases, violent anal sex is had afterwords. This is sometimes followed by a mean batch of Denny's pancakes. Word.
Yo get this shit. Last night, I had my girl rip a bong of some OG Kush and she gave me a smoke stack!
by YoungbloodHU October 14, 2010
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6
The act of sitting on the toilet and masturbating violently with one hand and smoking a joint with the other, while taking a big, greasy dump.
Chris was so tense from his bad day at work he needed to go do a smokestack in the bathroom before he could calm down and hang out with his friends.
by DLTC March 27, 2007
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7
A person who you will never see without a cigarette '
A person who is constantly smoking a cigarette from the minute they wake up to the minute before they fall asleep.
My Father acts like a smoke-stack, blowing smoke all day long!
by secondhandsmoker November 30, 2010
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