Clump, as of dirt, can be defined as a mass of soil or other material that has been compacted together. It is usually formed by the accumulation of small particles of soil or other materials, such as sand, gravel, and clay. Clumps of dirt are often found in areas where there is a lot of foot traffic, such as parks and playgrounds. The term CLOD, which is a four-letter word, is another way to refer to a clump of dirt.