A heads up
offered by a look out
that an invidual not down
with, adapted to acceptance of, or directly invovled with the groups illegal activity, such as the buying or selling of illegal drugs, is approaching. The invidual is a stranger and without right or reason to be there, even if the place is public, as it is gang territory.
5 0 call is offered without regard to whether the stranger is or is not a member of law enforcement; it is determined soley on trust
i.e. whether that person is cool
in the cultural sense, not the popular sense.