I usually don't feel compelled writing a review, but when reading most reviews already posted I needed to add the following: People complained about the movie being raunchy and containing too much dirty jokes, what else did you expect.. it literally has the word "dirty" in the title. It is not some French romantic love story, nor is it pretending to be. It is a funny road trip story filled with a lot of "fucks" and childish (hilarious) jokes which if you like these kind of movies will definitely keep you entertained until the end. And, ultimately it even has a small underlying message to teach you. If you are looking for something more serious, then please don't go and then complain after, maybe try checking out something else.
Jason Kelly [Zac Efron] is one week away from marrying his boss's uber-controlling daughter, putting him on the fast track for a partnership at the law firm. However, when the straight-laced Jason is tricked into driving his foul-mouthed grandfather, Dick [Robert De Niro], to Daytona for spring break, his pending nuptials are suddenly in jeopardy. Between riotous frat parties, bar fights, and an epic night of karaoke, Dick is on a quest to live his life to the fullest and bring Jason along for the ride. Ultimately, on the wildest journey of their lives, "dirty" Grandpa and his uptight grandson discover they can learn from one another and form the bond they never had.