Rabba Main Kya Karoon revolves around the story of a boy named Saahil (Akash Chopra), who is hopelessly in love with Sneha (Tahira Kochchar). The couple plans to get married, but Saahil's wicked elder brother Shravan (Arshad Warsi) tries to teach the lessons for a successful marriage to the innocent, loyal Saahil.
Shravan together with his three uncles try every bit to push Saahil on the wrong path and make him cheat on his girlfriend Sneha, with whom he is soon to get married. Saahil gets inspired and even tries to cheat on Sneha, but somehow he couldn't do so. Saahil realises that he couldn't cheat on his ladylove at any cost. But unfortunately, things take a worse turn that leads to misunderstanding between Saahil and Sneha.