noun
butting in; interrupting a thread; reply from someone who butted in
Internet slang for interrupting an ongoing discussion on a message board, mailing list, or similar platform, or the reply itself. Compare 横レス, which refers to a reply that goes off-topic.
See also: 横レス
スレッドに割り込みレスが入って、話が混乱した。
Someone butted into the thread, and the discussion got confused.
その割り込みレスは、元の話題とまったく関係なかった。
That interrupting reply had nothing to do with the original topic.