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1.
Similar to game plan, it's the idea of figuring out what you're going to drink at parties/bars/events.

Availability of the drinkplan may be based on levels of monetary fundage.

Can be used to denote how MUCH one will drink at a party/bar/event.
"Hey man, what's your drinkplan for New Year's Eve?"

"Oh man, I get paid on the 2nd, I only have a $20. I'm thinking a 30'a Stroh's or a buncha tallboys'a Molson, eh?"

"Hey dude, how much you gonna drink tonight? What's your drinkplan?"

"Heavy and often, like my sex."
by Albama December 30, 2012