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The sweat in an ass crack.
example 1:
I'm sweating so bad, I have to go to the bathroom and wipe off my bum juice.

example 2:
That fatfuck left a bum juice stain on my sofa!
bum juice by Bob "Fuckin'" Martin October 29, 2007
A bottle one has urinated in (typically in a moving vehicle), put the cap back on, and thrown out the window to be picked up by a bum that will drink anything he finds on the side of the road.
Hey, look! Bum juice! Awesome, I am soo thirsty.
Bum Juice by Urinator5000 October 24, 2011
A clear or slightly cloudy viscous liquid with a unique odour that is secreted from the colon or rectum especially during anal sex.
"Wow we had such great sex last night, I self-lubed and I've been popping out turds greased with bum juice ever since."
bum juice by Macro Evolution February 29, 2004
The beer at the bottom of the bottle. It can also have cigarettes and ashes in it to make it even worce.
I grabbed the wrong bottle and got a mouth full of bum juice.
bum juice by Michael A Goodrich December 1, 2006
A liquid concotion consisting of urine, blood, cum, and trash. Usually found on items of stolen clothing that a homeless man in Philadelphia would try to sell .
"Gregg, I'm pretty sure that's bum juice that's on your six dollar pea coat," Lauren announced.
bum juice by thisisawesomeawful November 24, 2010
A homeless mans urine. Abundant in the Chicagoland Area.
While walking through an area highly trafficed by bums, "Man, it smells like bum juice around here."
bum juice by jason mc robot January 29, 2007