"All-y'all" is the collective plural for a group of groups. The term has been used for at least a century, so while it is certainly regional, it is not new.
For example: at a sports tournament when you are giving directions to various playing fields, you might say to the Lions, "Y'all are on field 6.", but when a random crowd of spectators are all clamoring to know which field their team is on, you need to holler, "All y'all need to be quiet and let me answer one question at a time!"
These days I most commonly use it when speaking to relatives about family reunion plans. I will use "y'all" when asking Cousin Ginnie about their nuclear family, but "all y'all" when I'm asking them about all of the families related to their mom, my Aunt Cissy. (Examples, those names; I don't actually have a Cousin Ginnie or an Aunt Cissy, but plenty of people in the South do.)
;-)
PS: What does "ope" actually mean? I've got no clue.