subs. (common).A large quantity: e.g., STACKS OF THE READY = plenty of money.
Verb. (gaming).To make cards in a pre-arranged manner for a crooked game; TO PACK (q.v.); TO STOCK (q.v.).
1896. LILLARD, Poker Stories, 54. The cards were STACKED and marked on the back, so that he didnt have any chance at all to win.