prius lane Share definition Flag The Prius Lane, aka the slow lane, where all the Prius drivers crawl for maximum MPG... Wayne: "Why is the right freeway lane always so slow?" Van: "Because it's the Prius Lane!" prius lane by dimmesdale April 28, 2014 0 0 Get merch Get the prius lane mug. Buy Now — $32.95 See more merch