To dream of the bogeyman represents feelings of fear or anxiety about terrible behavior that nobody else notices. Feeling that people get to abuse you, pick on you, or scare you without anyone else witnessing it or believing it.
Negatively, the boogeyman may reflect frustration that nobody will listen to your worries or complaints about being tormented. A bully in your life that gets away with it in secret to your face.
Alternatively, dreaming about the boogeyman may reflect irrational fears based on unobjective assumptions. Fearing the unknown or something that is never proven.