The act of taking a crap in the filling tank of a toilet. When someone flushes it later they will get a surprise when the tank fills up with...well you know.
( by the way the filling tank is the big white thing thats behind you when your going number 2, has a lid on it, it's full of water and a few moving parts)
Jake got caught double stacking at wal-mart again!
by M. Weazel January 30, 2006
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The act of defficating in the filling tank of a toilet. The next time someone flushes it. They will get a suprise when the toilet refills itself.
Dude! I caught Jake double stacking my toilet again!
by M. Weazel January 31, 2006
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When someone sits on the toilet and another person sits on their lap to shit and uses their thighs as a seat.
Tony was shitting and Sam needed to as well, so Sam sat on Tony and used double stacking to shit.
by shit-bag October 13, 2010
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when 1 pill has the same effect as 2 pills of the same kind of drug
is that X double stacked?
by VCO June 19, 2005
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1. somone with botha big ass and tits

2. a pill that has the same effect as 2 of the same pill

3. a PMA pill being sold as "thick" an MDMA (exctasy) pill
1. jennifer is double stacked

2. see look its double stacked, it'll hit you better

3. to fred: lets make him really ill
fred to sally : gove him this - look double stacked
*gives punter PMA*
to punter : look its thicker
by blowjob bill June 18, 2007
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A completely platonic, heterosexual event whereby two men defecate in the same toilet at the same time. As the bottom member of the stack, it is important to observe a proper tucking technique, lest an embarrassing and unsightly mess ensue. Once a double stack partnership is established, it shall persist for the duration of the bottom member of the stack's terrestrial life. Once the bottom stack member passes, the top member is free to pursue a new partnership, excepting that the new bottom member is related to the previous by marriage. A widowed bottom stack member forfeits their freedom to establish a new partnership.
Brian and Josh were a feared duo. They fit together like a jigsaw puzzle, their bodies working in perfect accord. Their office knew not to fuck with their double stack.
by von dildus August 11, 2008
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Putting two hits of ecstasy into one pill for a higher price that will have a greater effect.
T-mac: that girl just took a double stack of e.
by fish121 June 7, 2006
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