Local Chontelle Sands is heading up the move, which was also prompted by arsonists and off-road trail bike riders.
She said rock throwers, who have provided nightly fodder for social media users for about a month, were the straw that broke the camel�s back.
�It seems like every night there is something online about it and this is really the thing that motivated me to get the group going again,� she said. �What seems like harmless fun can obviously turn out to be something a lot worse.
�That�s why we as a community need to do something about it.�
Spearwood mum Andreia Volas told the Gazette she was on a bus with her six month old son last Thursday afternoon when a rock was thrown at the windshield.
�I didn�t see how big the rock was but the noise was � wow,� she said.
�A normal car wouldn�t stand a chance.
�I don�t think I�ll be catching a bus for a while and I�ll drive around (the suburb) if I have to.�
Another on social media recalled how she was lucky a dent to her car was all she received during a recent incident.
�Twenty centimetres higher and instead of just denting my rear door it might have put my two-year-old in hospital,� she said.
A third person affected was a Yangebup local named Matt.
His parked car was dented when a rock was thrown at it around midnight two weeks ago.
�It really annoyed me having rocks thrown at my car for no particular reason,� he said. �I don�t really understand how it�s still happening.
�I think more people should come forward and report it to police.�
Cockburn Police say they have looked into a couple of incidents, while Cockburn Council�s official stance is that it is a police matter.
Three locals near the intersection of Osprey Drive and Tern Loop, a location reportedly notorious for the activity, admitted they had not seen anything themselves.
�I have heard it but I haven�t seen anything,� one person said.
�It�s mainly the hooning and the trail bikes (which are a problem).�
Ms Sands is currently organising a community meeting, planned for May 13 at Yangebup Primary School. She said the aim was to get reps from council, local police and local MPs to attend.
Deputy Mayor Carol Reeve-Fowkes said she would attend, keen to see the issue addressed properly.
�It�s true it�s a police matter but we need to ensure the community is being heard,� she said.
�What starts out as a prank can quickly escalate to a tragedy.�