A person reduced to abject poverty and squalid living conditions, especially an alcoholic or drug addict. He used to run one of the most successful companies in the city, but then the market crashed and he wound up as a skid-row bum. I have to walk by a couple skid-row bums on my way to work who always beg for my spare change.
See also: bum
skid row bum
n. a down-and-out person; a low alcoholic beggar. Do you want to end up a skid row bum?