trunk or treating

Is ‘Trunk-or-Treating’ Really A Thing?
Is ‘Trunk-or-Treating’ Really A Thing?
Is ‘Trunk-or-Treating’ Really A Thing?
I'm the dad of a 3 year old boy and as I was looking for Halloween things to do with him this weekend multiple suggestions came to me from friends, family, etc. One particular suggestion came up on multiple occasions: trunk-or-treating. Why do I literally feel like the last person on Earth to know of such a thing?