The phrase typically refers to a specific subtitle file or release tag for the iconic Bollywood film Dilwale Dulhania Le Jayenge (DDLJ).
The most famous line is, "Bade bade deshon mein aisi chhoti chhoti baatein hoti rehti hain" (In big countries, such small things keep happening). Potential Interpretations of "REM" Depending on where you saw the text, it might mean: subtitle Dilwale Dulhania Le Jayenge (1995) REM...
The story follows two non-resident Indians, Raj (Shah Rukh Khan) and Simran (Kajol), who fall in love during a trip across Europe. The phrase typically refers to a specific subtitle
A "Remark" or "Reminder" used in coding scripts to comment out text (common in batch files). subtitle Dilwale Dulhania Le Jayenge (1995) REM...
A "Remux" version of the movie with associated subtitles.