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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.
Stacks by StaxxMoney December 7, 2013
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
Stacks by angela scott February 12, 2009
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
Stacks by J.A. Johnson September 29, 2011
what the lady's be after and what a g be holdin
"She after them stacks"
Multi-layered ecstasy pills. Commonly found at raves.
Wanna buy a triple-stack butterfly for $20?

Wanna parachute some stacks and roll for a few hours?
stacks by addict7 June 27, 2006
"Stacks" is a wanna-be gangster nickname given to metro-sexual men who's sexuality is in question. It should be used to replace this person's real name in all social situations. Also used to fill awkward moments of silence with humor.
"We need to start calling that dude Johnny Stacks, because I think he might be gay"

(awkward silence)..."Yo, I think Stacks is gay"
Stacks by Lokitricks May 27, 2010