The concept behind this is the deconstruction of the fictional anatomy of a fat man through a series of pokes. Each poke serves as the man losing an important layer of his body. In the end it comes down to just his stomach, and we discover the reasons that made him fat in the first place.
Eventually the fat man is stripped beyond the point of bare-naked so he decides to act as a vacuum and suck back everything that was taken from him. This explores the ?rebuilding? of his body back to its original shape: fat and round.