Nug is a shortened form of the term “nugget” that refers to trimmed buds. In some cases, the nugget can be used to refer to the quality cannabis products, but the word usually applies to high-quality cannabis bud material. If cannabis has low quality, it is called “schwag” which is the opposite of nug.
Some specialists use the term “nug” to refer to marijuana in general, mainly because of the way it’s sold.