That is the phrase that Warman coined when he was speaking to a group of Anti-Racist Action...er...people.
He outlines his strategy for fighting "Nazis" (a term he seems to apply to people somewhat indiscriminately).
Here is a link to a copy of that speech for your reading enjoyment. It is probably the only copy left on the internet as he has made copyright claims against everyone who has posted it so they take it down. (You'll see why).
That speech is one of the things he sued us for copyright over in the case he lost and appealed. That is going back to court next week.
No matter what you think of David Icke, I think you will be shocked to see what Warman was doing on that video, and you'll see why the jury wasn't allowed to see it because, in the judge's words, it was "too prejudicial".
Significant sections are at 30:18 - 32:08 and 38:51 - 40:34.
Spoiler: If you watch to the end, the attempted assault actually did take place.