蛇 means 'snake'

This bundle presents not only inebriated people but also drunk "animals." The Japanese associate heavy drinkers with 蛇 (because of wordplay and because a giant snake can swallow a lot at once) and with 虎 (given that excessive alcohol makes folks as wild as fierce tigers). But drunks classified as 蛇 versus 虎 behave differently; one is far more annoying. Regarding bad behavior while drunk, the 酔 essay paints a full picture, from driving while sloshed to annoying God! And the 没 essay touches on passing out from drinking ("falling into a sea of drunkenness") and liquor as one's downfall.