If you are searching for the high-quality, legal stream of The Hangover Part III with Tamil audio tracks, several major platforms host the Warner Bros. catalog in India:
Released in 2013, The Hangover Part III departed from the established formula of the first two films. Instead of a forgotten, alcohol-fueled night of debauchery before a wedding, the third installment plays out like a dark comedy road trip and a heist film.
No need to follow previous parts. The Tamil dub works as a standalone dark comedy.