Billy, in his youthful days, was the best hand at doing nothing in all Europe; devil a mortal could come next or near him at idleness; and, in consequence of his great practice that way, you may be sure that if any man could make a fortune by it he would have done it.
It's a part of 'The Three wishes" by William Carleton. (Irish Fairy and Folk Tales by W.B. Yeats)
I simply can't figure out the above 'devil a mortal' in terms of meaning and grammar.
Please help me.