An (informal) event in which individuals consume large amounts of alcohol with reckless abandon, or in other words, suck down the alcohol. A happening defined by hedonism and bro-ishness.

The term was popularized by the Instagram account, Friday.Beers.
Armand: I’ve got the Buds, I’ve got the tequila—it’s suckdown time
Joseph: Hell yeah, let’s suck these cold boys down
by duolingo_daddy June 16, 2020