When a group of academics peer pressures each another into pouring a few litres of beer into a tube designed for holding a conference poster, and passing it between them to chug from as if passing a joint.
Originated at RSS2019 in Schlappen, Freiburg.
Academic 1 to academic 2: βHey, drink from this poster tube!β
Crowd of academics: βposter session! Poster session!β