What does it mean when bird poops on you in dream?

Both the excrement and the bird are symbols that your mind is using to represent other things. The bird might symbolize a person, particularly someone who might be bird-like or have a bird related name such as Robyn or Falconer, etc. It could also represent an organization - if the bird is a bald eagle, it would represent the U.S. government. The excrement simply represents your feeling mistreated and dumped on.