Kei Jidosha Share definition Flag Japanese for "light vehicle". A class of vehicle that is very popular in Japan due to ease of registration and miniscule size. "Dude, have you seen the new Suzuki Cervo? It's really nice." "The kei jidosha?" "Yeah." Kei Jidosha by Shant Jaltorossian June 23, 2008 0 0 Get merch Get the Kei Jidosha mug. Buy Now — $32.95 See more merch