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"
When you ask a poor person to give you a lift home in your rich friends rolls Royce you say it’s totally fine to use then they get busted for grand theft auto after you get home safely and tell them to drop the car back for a huge cash bonus just for doing that without a mistake.
Oh bro see that scum bum I pullled off on Thursday ? Yeh and that guy had just read that chicks diary and installed cameras in her bathroom for internet likes too without her permission I’m a fucking genius!
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?”