A single stack magazine holds all of its cartridges in one column. The double-stacks holds its cartridges in two staggered columns a.k.a. Zig-Zags
-How many bullets does yo Glock have?
-30 hollows dude, double-stacks
by AsiAce October 30, 2021
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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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An act that requires one man to sit on another man's lap, naked.
The man on top spreads legs and bends forward so that both dicks are stacked together. The man on top provides manual stimulation to both of the touching dicks.
"Hey! Grab some lemonade and tea and we can go to Dave's house, make some Arnie Palmers and double-stack the day away!!!!"

"That sounds AMAZING, I will take pics of your stacked dicks!"

"Woot woot"
by Defwinston July 27, 2014
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The art of dropping a deuce over a previous deuce that has clogged a toilet. The act of double stacking most frequently occurs during emergencies and is generally considered bad form.
Bill could not hold the deuce brewing inside him and his only option was to use the clogged toilet in the hotel room he was sharing. Bill ended up double stacking in the toilet.
by Heath McRigsby July 26, 2006
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The act of taking a shit in a toilet already filled with shit because either
A.) It has become clogged or
B.) You're having a Double Stacking contest
J: Man, I was at Ray's the other night and had to take a monster shit, but when I got to the bathroom, the only toilet was already full of putrid shit!
DOOKIE: NO! What'd you do man?
J: Well I tried to flush it, but it just spun around a bit. There was no way I was gonna make it home without squirting all over myself.
DOOKIE: Dude, tell me you didn't....
J: Yep, I just Double Stacked it.
DOOKIE: FOUL!
by The Cheetah Dude July 14, 2005
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(transitive verb): The act of having sex with two women at the same time. Technically this refers to instances where the women are stacked on top of each other, stomach-down. Colloquially, however, double-stacking is used to mean any act of a threesome where one or more men have sex with two women at the same time.
Bro, look at those two fine-ass hotties. Let's double-stack those bitches and take their temps.
by Aaron54 March 31, 2008
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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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