Its a word my friend Richard made up. Means absolutely nothing at all. I could make up a definition. Maybe I'll try...

JUST WHAT THE HELL IS A CHUDDLEYBUM?

chudd·ley·bum N.: (1) a bum that is chuddley (2) a person that resembles a chuddleybum (3) an expression  meaning that one being referred to is a poor, vagrant, disease-ridden person of illegitimate heritage.