I am born and raised 10 min south of Boston and have never ever heard buggies used at the grocery store. We say shopping cart or carriages.
I say lunch for midday and I say dinner for the late day meal. My parents and older relatives say supper though.
This is how I was raised and how it seems to be in the majority of my community (South Florida).Lunch at noon, dinner at six, no one uses the term supper here.
Here in NY State it's lunch in the mid-day and dinner in the evening. But don't get me started on the "soda" vs. "pop" debate.