It’s a term used to signal the start of a planned demolition of a building, “Pull it.”
Silverstein supposedly said it to the demo guys prior to building 7 falling; I recall seeing vid of it.
I had just turned on the tv a minute or so after the first plane hit. I saw the 2cnd one hit in real time. Seems to me Silverstein was likely in on the whole thing. He sure made out like a bandit — got paid double the amount cause he convinced a judge that it was 2 separate incidents can't recall all the details — fishy as all get out.