* Moldy Hay: This image conjures up a sense of decay, dustiness, and a lack of freshness. Hay that has been left out in the elements and has started to mold is often discolored, brittle, and has an unpleasant smell.
* His Hair: This refers to the person being described. The speaker is comparing their hair to moldy hay.
Overall meaning: The phrase suggests that the person's hair is:
* Unkempt: It's likely dirty, tangled, and has not been taken care of.
* Unhealthy: The comparison to moldy hay implies that the hair is brittle, dry, and perhaps even has a foul odor.
* Unattractive: Moldy hay isn't considered appealing, so the comparison is likely intended to be negative.
Example: "He walked into the room, his hair like moldy hay, and his clothes were stained with dirt."
This phrase can be used in a variety of contexts, from a descriptive passage in a story to a casual conversation. It's important to remember that the metaphor is subjective and can be interpreted differently depending on the context and the speaker's intent.