What is Dumb Bum?
a bum being someone who is jobless; a dumb bum being one who is dumber than your average bum...
Steve is a dumb bum.
I was a dumb bum.
Kate will never be a dumb bum.
We are all dumb bumming around tonight.
Dumb bum's rock, innit bruv!
See dumb ass, dumb arse, silly, steve