It seems you're asking for a guide to a movie titled "Majnu Nani."
However, there is no widely known film by that exact title in major Indian cinema (Hindi, Telugu, Tamil, Malayalam, or Kannada) as of my current knowledge cutoff.
You are likely referring to one of the following popular films. Please check which matches your memory:
So, next time a friend asks you, "Hey, have you seen the Majnu Nani movie?" you have three options:
Regardless of your answer, one thing is certain: The "Majnu Nani movie" has achieved immortality. It has never been shot, never been edited, never been screened—yet millions have "seen" it.
And that, dear reader, is the magic of the internet.
Indian meme pages realized that pretending a film exists is funnier than reviewing a real one. Creators began splicing clips:
They overlay text: "Scene from Majnu Nani movie (Theatrical Cut)." The comments explode: "I cried so hard in this scene." "Why is no one talking about Nani's performance in Majnu Nani?"
A comedy-action film starring Mahesh Babu (hero's name is Nani), but no "Majnu" in the title.