1. What does it mean?
Short for 먹는 방송, an 'eating broadcast.' The central activity is someone eating while viewers watch; conversation, food descriptions, or eating sounds may be part of the format.
Also written or said as mukbang, meokbang
2. The nuance
먹방 names a format, not a requirement to eat an enormous amount. A recipe demonstration is not automatically 먹방 if the main focus is cooking rather than eating.
3. Examples
“배고플 때 먹방을 보면 더 배고파져.”
Watching eating videos when I'm hungry just makes me hungrier.
“이 채널은 많이 먹는 것보다 맛을 설명하는 먹방이 좋아.”
I like this channel's eating videos because they describe the flavors rather than focus on huge portions.
Sources
Korean Cultural Center Germany: Korean food culture
References support the meaning and usage. Example sentences are written for NoCapWiki.