To be able to apply more than once, or combine with something else that has the same effect. Comes from video games and pen-and-paper RPGs.
The flyer says "30% off all jeans". Does that stack with the student discount?
by Seahen June 26, 2011

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A section of the library that is rarely used, such as the history section, that is an ideal location for sex.
My boyfriend and I went to the library to study for our history exam but we had sex in the stacks instead
by angela scott February 12, 2009

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Noun

\╦łstaks\

An elaborate hairstyle resulting in multiple layers and textures. Typically rendered by utilizing several styling techniques including weave extensions and braiding.
"And this bitch got like 12 stacks in her head, old school bitch. She got like stacks on the left, stacks on the right"

Artist: Mannie Fresh
Album: The Mind of Mannie Fresh
Song: Pussy Power
by J.A. Johnson September 29, 2011

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An even large amount of bills in the form of cash stacked up on top of eachother, usually held together with a rubberband or a paper band straight from the bank. Its not a stack if its folded.
Most people go by 100's

100 hundred dollar bills $10,000
100 fifty dollar bills $5,000
100 twenty dollar bills $2,000
100 one dollar bills $100

Or you could go by 50's or 10's

50 hundred dollar bills $5,000
50 fifty dollar bills $2,500
50 twenty dollar bills $1,000
50 one dollar bills $50

10 hundred dollar bills $1,000
10 fifty dollar bills $500
10 twenty dollar bills $200
10 one dollar bills $10

All of these can be excepted as a Stack. It just depends on how wealthy you are.
"Aye, Im rollin in the checks, I got stacks on the deck."
-me

"We be stackin this paper up"

"Last night i hit the strip club with a stack and made it fucking rain."
by JakeSAUCE November 18, 2007

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a stack is a speaker set up most commonly found at Free partys or raves consisting of bass scoops, W,bins, horns and tweets an mids. a good stack is at least 8ft tall an full of 18" drivers
shit look at that Stack it looks massive this is going to be a good party i think.

yo bob ive got some new bass scoops to go with our Stack

shit hot are next party is guna fuckin hum
by garyant February 05, 2010

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An insult given to another person in an argument. It is commonly used on a person who has talked smack and or is being a smart ass.

Both sides can give the stacks, which will escalate to a bigger argument. However, it is not uncommon for one person to be the only one throwing the stacks.
Matt: Damn, man! Does your mother still dress you in the morning?
Avery: Woah! You're about to catch one. I'm about to give you the stacks.
Your forehead looks like a fucking Honda windshield.
Matt: Alright man, Chill. Chill.
by Chelsxa January 19, 2012

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Aussie slang for crashing and/or falling off something accidentally or falling down. Usually when operating a vehicle.
Jack: What happened to your rear end?
Andy: Mate, I was riding down to Maccas in only me Speedos when I slipped off the back of me seat and me nads got wedged between the back wheel and frame of me pushy! I then stacked it into a rose bush and I couldn't move - me nads were stuck!
Jack: You'd be spewin!
Andy: Fucken oath!
Jack: So how'd you get free?
Andy: Well, the Ambo got there about 20 minutes later and after cutting away what was left of me Speedos, which was fuck all, they tried for about an hour to get me sack out.
Jack: Were you spewin?!
Andy: Shit yeah! Big time! They were gonna use a crowbar to...
Jack: Fuck me! A crowbar!
Andy: Fuck yeah, I know! When the granny - whose rose bush I fubared - chucked the ambos some Vas and said "That'll do the trick, fellas". That got me tackle out in bugger all time. No dramas.
Jack: Sweet. How's ur nads now?
Andy: Sweet as, mate.
Jack: Sweet.
Andy: Sweet.
Jack: No wukkas.
by goochi October 05, 2007

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