Interpretation of dirt in dreams is related to the appearance of the dirt. The dirty color represents pollution, filth, or immorality. Seeing mud everywhere likely means that the dreamer feels so polluted by their deeds — usually guilt-related and carrying some type of regret about it — that they have completely isolated themselves from others to avoid being marked with any more dishonesty. Dustiness suggests disappointment in oneself that is characterized by inadequacy, mistrustful perspective and anxiousness — probably due to impurity.
One explanation for how dirt appears in the dreams of many people is based on our subconscious feeling of guilt or uncleanliness. Sleeping with someone we are not romantically involved with, or even engaging in sexual activity during sleep could also be influencing our emotional interpretation of dirt.
Dreams about dirt can be attributed to an individual’s feelings about their personal cleanliness or lack thereof. Dirt on the ground can symbolize an embarrassment for oneself––a negative feeling one might have if they commit a wrongdoing without others witnessing. Dirt under someone’s fingernails could be interpreted as a disgraced person who lacks intentions of owning up to past sinful behaviors.