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荒らし arashi
A troll wrecking the thread.
What does arashi mean?
From a verb meaning "to lay waste". Someone who floods a forum or comment section just to ruin it. The standard Japanese advice is 荒らしはスルー — don't feed them.
Example
荒らしが来たので、コメント欄を閉じた。
A troll showed up, so we closed the comments.
Vibe
Who you can say this to, and how it lands.
Be careful This one carries weight. Read the meaning and the story before you say it to anyone.
The story behind arashi
荒らす means to lay waste, the verb you would use for a storm going through a field, and 荒らし names the person doing it to a thread. It comes from the bulletin board era, when a single determined poster could flatten a whole community overnight and no moderator was awake.
Out of that era came the standard advice, still repeated today: 荒らしはスルー, ignore them, plus the sharper corollary that anyone who responds to a 荒らし has become one. Japanese communities really do practise this, which is why a comment section can go strangely silent around an obvious provocation. Silence here is not indifference. It is a technique, and it mostly works.