Wiktionary
Etymology 1 n. (context buzzword English) A person in postindustrial society who combines the economic roles of producer and consumer. Etymology 2
a. 1 (context marketing of a consumer product English) Targeted at serious, enthusiastic consumers, incorporating professional features but often modified for non-professional use. 2 (context marketing of a consumer product English) high-end n. A serious, enthusiastic consumer: not professional (earning money), but of similar interest and skills to a (generally lower level) professional, or aspiring to such. The target market of '''prosumer''' equipment.
Wikipedia
A prosumer is a person who consumes and produces media. It is derived from "prosumption", a dot-com era business term meaning "production by consumers". These terms were coined by American futurist Alvin Toffler, and were widely used by many technology writers of the time.
"Prosumer" is also a trade term, used from a business perspective, for high-end electronic devices (such as digital cameras), meaning a price point between "professional" and "consumer" devices.