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A stack is an insult or an acknowledgement of an insult.
Man: You are pretty.
Woman: I still wouldn't go out with you.
Man's friend: Stack!
by flynigs April 04, 2011
a myth created by ecstasy dealers to get you to pay more for pills, by staing they're double or triple "stacked" they imply that there is more MDMA (ecstasy) in the pill. in reality, it means nothing.
guy: "hey, i got triple stacked blue dolphins"

me: "how much are they?"

guy:" thirty apiece, but they're triple stacks, man..."
by MollySurprise! November 07, 2008
to fall over or crash badly resulting in great injury or damage
Stu: How did you break your legs?
Al: I was running down the stairs and i stacked it big time
by Wise Man July 15, 2003
10,000 dollars. 1,000 is "large" like on the sopranos.
"I've got over ten stacks for my man" -2fast2furious
by sloggy October 02, 2003
"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"
by Lokitricks May 27, 2010
a cigarette. a large amount of money
anyone got a stack?
stacks on deck.
by gs and nm December 15, 2007
a big wad of money usuall wrapped with a rubberband from either selling drugs or making profit off hoes
If its taking too long to lock up bring it back,
You was short anyway so bring a stack--young jeezy(boyz n da hood)"Dem Boyz"
by $$<a-town rep>$$ December 14, 2005