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2.
a phrase, chanted repeatedly, when you want someone to finish their drink in one gulp.
man 1: dude, we gotta hurry or we'll miss the game!
man 2: just let me finish my drink, okay?
man 1: down in one! down in one!
by parlejeudi July 09, 2009
 
1.
Chugging a beer in one shot
At the bar Steve raised his glass, made a toast, and did a down in one.
chugging drinking
by Scpeck May 25, 2013