The Joker steals a prop Jokermobile, and as he drives away, he removes a sign from the windshield which reads "Wan the cirin gnal Jokernocile." This was probably meant to read "Win the original Jokermobile" but got lost in translation with the Asian animators.
The casino (and the episode) is named Joker's Wild. This is a gambling term that refers to a joker that is a wild card. This term actually sums up the episode: the Joker goes wild on a casino. However this also pays tribute to a Batman (1966) episode, also titled "The Joker is Wild."