Do we know anything about this guy 'Roily,' if he's from anywhere in particular, like maybe the Caribbean or somewhere with its own argot?
Are you sure it's 'b-o-l' with an L, and not, say, an I (i)? I have a vague memory of seeing something like 'boi' as an alternate spelling for 'boy' in some context.
If deliberate misspelling / alternate spelling is an option, could 'dukie' then by any chance mean 'duckie / ducky'?
If it really is an L, you could read the hypothetical original word as either 'bool,' with a U sound to rhyme with 'fool' (or possibly with 'book,' but that seems less likely), or as 'bol,' with an O sound, either as in 'bole' or possibly as in 'ball.'
But none of that would seem to make any sense anyway, sorry.
Maybe someone else will have a better brainstorming idea.
*edit* No, forget all that.
Going back to #1, that looks like it could be the right track.
If 'dukie' means 'shit,' then 'bool' could just mean 'bull,' and it would just be a more colorful way of saying 'all that BS.'