Answer:
Answers:
1) Stacks on Deck means having alot of money to toss around like a stack of cash and deck refers to you holding or having the cash on you
2) I've never heard the phrase "stacks on deck" before, so I'm not how viable the answer "having a lot of money with you" is. However, stacks does refer to stacks of cash. In bar lingo, "deck" generally refers to behind the bar. For instance, in many states it is only legal to have 2 alcoholic drinks in hand, but if you can sometimes order one more and have it in the "hole" or "on deck." You often do this if you want to close your tab to meet the minimum the bar takes, or if you want to get the most out of the happy hour special.
In my interpretation, "stacks on deck" implies money on the bar, hence the second verse of T.I.'s song "patron on ice." However, the typical response, "having a lot of money on you" also works.
3) There is also a third meaning floating around that refers to the music. As in, there is a stack of cds/beats and "on deck" is similar to a batter being "on deck" or next.