Crud (noun)

1. A mixture of dirt, filth, or other unwanted matter.
2. Something that is considered to be of poor or low quality.
3. A mixture of several things that are not well combined.

Origin:

Late 19th century: probably of scandinavian origin.

Examples:

1. The mechanic had to clean off the crud from the engine before he could repair it.
2. The crud on the floor was a mixture of dirt and oil.
3. The movie was a crud and a waste of time.
4. The band's music was a crud of different genres.
5. The software was full of crud and needed to be completely rewritten.