A more thorough explanation:

Definition: Drift-stuff refers to any material that is floating randomly in water without any identifiable source. This material is usually considered the property of the riparian owner.

Examples: Examples of drift-stuff include pieces of wood, plastic bottles, and other debris that can be found floating in rivers, lakes, and oceans. These materials can be carried by currents and winds, and may come from a variety of sources such as boats, factories, or natural sources like trees.

Explanation: The definition of drift-stuff is illustrated by the examples provided. These materials are not intentionally placed in the water, but rather are carried by natural forces. The fact that drift-stuff is considered the property of the riparian owner means that the person who owns the land adjacent to the water has the right to collect and dispose of any drift-stuff that washes up on their property.