The film is just like its title...its full of masti..The story revolves around three friends vivek, aftab and ritesh(i dont remember the names of the characters)  who are quite fed up with their wifes (that is amrita, genelia, and tara). It all starts when these three friends decide to have a reunion and first they pretend to each other that they are quite happy with their wives but then truth is out.  They find themselves  in the same situation and so they decide to have an  affair.   After so many failed attempts they finally end up having affair with the same girl that is lara dutta.  This is when lara dutta comes into picture.  She asks them to get money from their wives and blackmails them that if they dont get money then she would show their photos to their wives. somehow they manage to get money from their wives. before they could think they are out of trouble, this time they find themselves caught in a even more serious situation when they discover that Monica( lara dutta) is murdered and they try to run from the place and at this point, ajay devgan (who plays a police officer) comes into picture.  He keeps an eye over them and moreover the murderer also starts blackmailing them.  no no people iam not going to give away the whole story. Its  a surprise ending and u have to find it out just watch it and enjoy. its a fun film.