Pour beer into a waterfall bong, sealing the bottom hole with your mouth.
Burn the marijuana bowl sealed at the top of the chamber. With the cannabis lit, chug the beer out of the bottom hole, drawing smoke into the chamber.
When only foam remains, tilt the foam away from the mouthpiece, and remove the slide/bowl.
Inhale the marijuana smoke through the same chamber.
Rumored to be invented in Pittsburgh, PA.
What's a beerfall?
You just shotgun beer out of a waterfall.
Oh shit we're about to get mega fucked up.