Welcome to the wild world of contemporary poetry, which is often as much about the ways people use language as about how they act. Ashbery pokes fun at the reader's need to figure out what a poem "means" by making part of "Farm Implements and Rutabagas in a Landscape" an "undecoded message." The cartoon characters seem almost to talk in riddles, especially Olive and Wimpy. The poem blends many different kinds of speech together, from the childish to the pretentious.
The poem should be understood as nonsense and lacks a consistent narrative. This doesn't make it a bad poem.