Puddles of disease-ridden and stinky body fluids left behind by homeless people.
The puddles could be anywhere, but are most often encountered on public transit systems.
The "juice" is an unknown mixture of any of the following: urine, diarrhea, rancid sweat, dirt, crabs, lice, blood from open sores.
Dude: I barely made my BART train and there was only one seat left. Always check the seat before you sit down. I sat on the damn spongy seat in a big warm puddle of hobo juice.
Dude 2: Damn dude, that's hella nasty. I'd check with the doctor to make sure you're not infected.
Dude: Yeah, I had to go home and shower. I wasn't going to go to the party smelling like hobo juice cologne.
A highly sweetend drink usually bought at convienience stores for .99 cents a gallon. It consists of mainly water, sugar and some fruit flavor. Also, the amount you drink seems to be disproportionate to the amount in the jug.
Guy 1: Dude, I'm thirsty, but I only have a dollar.
Guy 2: Let's get some Welfare Juice at the local convieniece store.
CRUNK JUICE FOR THE BAY AREA!!!. A combo of an energy drink, and hard liquor (it is said to have unusual results when consumed). A popular one is hennesy and red bull; there is a manufactured one called sparks. Originally created by lil' jon but bay areaized by rappers like E-40.