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A casual is typically kicking back and rocking a casual beer with a close friend. When drinking a beer, instead of pounding, shotgunning or any other form of quickly downing a beer in a typically uncomfortable fashion, the casual is much more relaxed and leisurely in nature. The casual is typically for after dinner, a study session, a work shift, or a long night of partying to discuss the events of the day.
"Dude, let's go rock a casual on the porch."

"Alright, I'm down. You still got those cigs?"
by raoulduke. August 18, 2011
To get smashed off your face drunk
Im just going out for a casual drink.
by little_terror05 May 22, 2014