To see mud in your dream suggests that you are involved in a messy and sticky situation. It also suggests that some spiritual cleansing is needed. 

To dream that you are walking in mud suggests that you are feeling weighed down by a situation, problem, or relationship. You are feeling frustrated.

To dream that mud has gotten on your clothing means that your reputation is being attacked and called into question. Consider the term “mud-slinging” to refer to some politicians.