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1.
An appreciable amount of money.
"I gotta keep my dough stack high if I want to rock that Benz!"
by Al-Van the Seafood King March 22, 2006
 
2.
A term used to describe American money, or more specifically, dollar bills.
<teen>: Hey mom, can you hit me up with some doughstacks?
<mom>: Did you clean your room?
<teen>: No...
<mom>: Then no.
by David Amsel March 12, 2008