It originated on a Domination stall. Someone, anonymously (though I believe it was Leechbait) posted “srtop it” after being attacked. It was an obvious typo, but another anonymous player (I believe it was an Arktor alt) proceeded to run with the typo and anonymously post “srtop it” several times over the next few days.

The next week the first post on every stall Arktor had a character in was an anonymous “srtop it”. Soon “srtop it” was the standard response whenever anyone was being hit with multiple Dom cards.