FCUK (Father, Chitti, Umaa, Karthik) is an adult comedy that revolves around the lives of its lead characters played by Jagapathi Babu, Baby Saharshitha, Ammu Abhirami and Ram Karthik. How Chitti affects the life of everyone around her forms the tale.

Patel S.I.R avenges the death of this son's family by going on a killing spree. He vows to kill everyone that was the reason for the death of his son's family before his blinded granddaughter gets her vision back. Why did the villains kill Patel's son in the first place? How a sixty year old Patel does have his revenge?