godan verb (-ru), intransitive verb
lurk; read without posting
Internet slang for reading posts in an online forum, chat, or social media without actively participating or posting. Derived from ROM (Read-Only Member).
See also: ＲＯＭ
最近は掲示板でＲＯＭるだけの人が増えている。
Lately, more people just lurk on the bulletin board without posting.
ずっとロムってたけど、今日初めて書き込んだ。
I'd been lurking for a long time, but today I posted for the first time.