The Ballad of a Slow Poisoner - Andrew Goldfarb - Bog

Herein are the singular adventures of one Millford Mutterwurst, who
one day makes the unpleasant discovery that his elbows are becoming
flatter - an unpleasant effect of the nefarious act of slow poisoning.
He is soon joined by a blue and globular companion named Slub Glub and
one translucent monkey in a frenetic balloon voyage to dangerous isles
and disturbing planets in a desperate attempt to escape this deadly
withering. A tale told in eighty dizzying chapters, all of them
exceedingly short, and filled with strange songs and oblique
illustrations.