the same movement is a handy way to stow the speed brake after landing-just momentarily advance the thrust lever but bringing it back before the engines wake up and the speed brake will stow
Don't you just hate it when people think up new gimmicks like this. I have observed this technique being used by a couple of captains in an airline I once flew for and there was a sudden EGT rise in the P&W JT8D engines on the 737-200. Surely this is not a standard procedure. It is just laziness.