Scum Bum

commonly used by people in the south; after somebody gets scum (high) as fuck this is what you call them

Joey: *just finished smokin a phat blunt* *walks over to Tim*
Tim: “Waddup scum bum? How you feelin?”

bum scum

The semi-permanent black gnar (stains) that collect on your hands if you're a habitual dumpster diver.

"Man, it takes two-weeks for me to scrub off the bum scum when I go visit my mom"