when a woman's shirt doesn't fit right and it looks like she has two sets of boobs, one set on top of the other.
Lauren: Wow, I don't think this shirt fits right.
Katie: You’re damn right it doesn’t! It gives you quad stackers!
by Kate Heals September 2, 2008
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A.) After taking a poop and wiping your anus realizing your not done then taking another shit on your previous shit forming a double stacker.

B.)Purposely made double stackers occur when someone takes a dump then decides not to flush to come back later and dump on it again
Me: Man earlier i was taking a shit and I thought i was done, pulled my pants up then it hit me again
Q: So what did you do? tell me you didn't...
Me: Yep made a double stacker
Q: Thanks for sharing
by tar_heel86 March 14, 2009
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The best burger ever created. think of the number of patties as bases. you know.
kerr sucks at eating the quad stacker because she just cant handle its extreme size
by Mrs. Fetters September 29, 2006
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The "Smurf Stacker" theory is a ground breaking theory created to explain the unique mating habits of Smurfs.

It was originally thought that smurfs reproduced much like humans with separate male and female genders, however this leads one to wonder why there are so few female Smurfs one of which being created by an evil wizard who is trying to eradicate them. The Smurf Stacker theory takes an entirely different approach theorizing that every smurf has both sets of genitalia, allowing them to both impregnate and be impregnated. It is believed that each smurf, under their each of their white hats, has a phallus and also a vaginal organ in their crotchal region. It is further theorized that during a mating event all of the smurfs in the village gather and assemble into a "Smurf Stack" which involves every smurf standing one on top of the other allowing simultaneous penetration.

Due to the elusiveness of the smurfs during mating season no one can either prove or disprove this theory and while it continues to be a hugely controversial subject among smurfologist it is quickly being accepted as the most plausible theory as to how smurfs reproduce.

note: wikipedia rejected this article claiming it was "unsalvageably incoherent"
"Bob dosent eat blueberry pancakes because ensuing thoguhts of smurf stackers sexually arouse him to the point of madness"

"Lets make like smurfs and stack!"
by Dan Johnston June 20, 2007
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"That guy is a pie stacker."
"You ate five burgers, you pie stacker!"
by Daimo_45 October 5, 2006
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When working in a Huhtamaki America's Mill, a person who stacks plates on any machine other than B-13 while it is running FRANKA, or any person who has never packed the afformentioned FRANKA 4 cup carrier. The Stacker Bitch will be known as such until he/she has done the said job, and also will be punished by back seat car rides until he/she has done the job. A Stacker Bitch is a human Pinata, so bash away when you see one!
Me: Jon is such a Stacker Bitch!
Drew: I know, He's been on B-14 all day. Make that stacker bitch ride in the back!
Me: Consider it done!
by J-LEW#99 July 20, 2009
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Navy term for Aviation Ordnanceman who's job it is to load bombs and missiles on military aircraft as well as load and maintain other aircraft armament systems. See Ordy
The BB Stackers are working round the clock with the Intigrated Weapons Team to ensure all aircraft are combat ready.
by Jolly Roger March 26, 2004
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