A phrase that is used mainly in the Great
Brook Valley section of Worcester Massachusetts which means
Drug Bust or Worcester PD. It is usually only used in Great
brook valley for the MOB Outlaw gang who traffics many drugs through the city. When yelled a Gang war is usually the result. If an outsider goes into Great Brook valley and yells it, they will most likely be shot.
WARNING:
Even if you don't yell 5 down in Great brook valley, you still should not go into it unless you have connections.