its refferring to the fact the person just took extacy.. stacks as in the excaty pill and on deck as in ur body.
lil wayne has a song called stacks on deck and they all talk about being geeked on sum extacy.
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Is when you shove your penis in a deck of cards and ask your sexual partner, "Pick a card any card." He/She will be tempted to pick your dick and then suck it.
He pulled a stack in the deck on me and it worked.
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Having someone on backup just in case you can't do something
Dude weren't you supposed to go help out with the tap performance last week ...no I got stacks on deck cause I asked my cousin to do it instead cause he's got a degree in this stuff