DISGUSTING DIRT can be summed up as FILTH, a five letter word. FILTH is defined as something that is extremely dirty or unpleasant, and is often used to describe dirt, garbage, or other unclean substances. It is also used to describe morally offensive behavior or language. In this context, DISGUSTING DIRT is a phrase that describes something that is extremely dirty and unpleasant, and is likely to evoke feelings of revulsion or disgust.