I'm a young millennial and Four Loko's were still somewhat popular at my college. Maybe it was just a localized thing.. they went under the name "sidewalk slammer" where you would (quickly) drink half of it, then pour in a Red Bull (or other energy drink). So still finding a way to get that combo of caffeine, and still using the (at that point) slightly "retro" branding?

Never tried one myself lol