Hey, I didn’t know that was a Canadianism! My husband and I (from Alberta and Saskatchewan) both know what a light standard is.
My mom used to do that, too, to some extent (putting on better clothes to go shopping). My grandmother’s generation did as yours did - dress up nicer, put on makeup and/or jewellery; my mom’s generation just got a bit tidied up; my generation put on clean clothes and tried not to look too gross, and young adults now go shopping in their pajamas and slippers. The next generation will probably roll in garbage and put on old rags before going shopping.
I was going to say the correct spelling was larrupin’, but I see that your version is one of the variants cited. I also wasn’t familiar with the “good-tasting” sense, as I first saw the word as part of Lou Gehrig’s nickname – the Yankee slugger was called “Larrupin’ Lou” because he gave the baseball a “good, sound beating”, as per the original definition.
We were told it was because of all the bugs that are attracted to it and drown in it. For us, bug juice was only ever red fruit punch. Other flavors & colors were never “bug juice.”