A holiday where the point is to get as fucked up as you possibly can.
From: Hipster variant of Seinfeld's Costanza family holiday of Festivus.
As the quote of the family was "Festivus for the rest of us," the Fucktivus version is "Fucktivus for the drunk of us."
Dude 1: Dude! Are you going to the Fucktivus softball game? We're bringing the keg to the field!
Dude 2: Dude! Would I ever miss the opportunity to drink enough that it is a bad idea for me to be swinging a blunt object?