Dirt / Dirty dream meaning is explained below using 1 different source. Each interpretation is shown with its source.
Interpretation 1 — James R. Lewis and Evelyn Dorothy Oliver
Dirt is associated with farming, and therefore with fertility and growth. Something underneath the ground symbolizes the unconscious. Because of the social importance of cleanliness, “dirtiness” has acquired many different connotations, from guilt, to unworthiness (“dirty white trash”), to sexuality (“dirty minds”).
Source: Dream Symbols in The Dream Encyclopedia • Author: James R. Lewis and Evelyn Dorothy Oliver