So basically some dudes were hanging around the hookah and talking about how they'd totally bomb some subways or those douches on Metro-North. And how they'd totally tap that hottie if she wasn't such an infidel. The FBI heard it and is reporting "there is nothing concrete to suggest the plot went beyond the talking stage." For either bombing or the booty.
ABC News: FBI Warns of al Qaeda Attack on New York Commuter Trains.