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36.
Four or more males having anal intercourse at the same time. Middle participants penetrate and get penetrated simultaneously.
1. After the party, some of the guys came back to mine and we stacked.

2. Let's make a stack.
by Andre March 16, 2005
 
1.
one stack = 1 G
by Anonymous July 14, 2003
 
2.
$1,000/ A Thousand Dollars
Yo, I only gotta stack to play wit for the weekend.
by Brath November 06, 2004
 
3.
1,000 dollars
My dubs ran me two stacks!
by pleth June 07, 2003
 
4.
Thousands of dollars. A stack is one thousand dollars. Stacks is a synonym for thousands referring in terms of dollars.
5 stacks is 5 thousand dollars.
by StaxxMoney December 07, 2013
 
5.
Noun

\ˈstaks\

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
 
6.
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
 
7.
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