1. What does it mean?
댓망진창 blends 댓글 with 엉망진창. It describes replies that have gone wildly off topic, descended into argument, or become a jumble of jokes rather than useful discussion.
Also written or said as daenmangjinchang
2. The nuance
It can be amused commentary on harmless chaos or criticism of hostility. It describes the state of the thread, not a specific platform function.
3. Examples
“사진은 평범한데 말장난이 이어져서 댓글이 댓망진창이야.”
The photo is ordinary, but the stream of puns has turned the comments into chaos.
“서로 욕하기 시작해서 댓망진창이 된 글은 닫았어.”
I closed the thread after insults turned the comments into a mess.
Sources
References support the meaning and usage. Example sentences are written for NoCapWiki.