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2.
When you've had a couple of drinks and get in the mindset to throw as many drinks down your neck as humanly possible, then inevitably do something stupid like beat up a pregnant woman or crap your pants.
"You better go and hide all the sharp objects, Lamberts got a massive Drink-On"

"Did you hear about the Drink-On Brady got last night? He drank a pint of vodka and then smacked Susan in the teeth"
by Witnica September 03, 2008
 
1.
To start drinking or A cup filled with booze.
"Get over here so we can get our Drink on"
or "Put down my Drink on and get your own"
by Angelique Pruitt August 19, 2008