The 47-year-old was performing with Pulp at the Scottish festival when he shared with the crowd his thoughts on the notorious Sunday tabloid, which was axed this week following a spate of hacking allegations.
After opening his set with 1994 track 'Do You Remember The First Time?', Cocker urged the gathered crowd to remember the News of the World's demise and lifted the final instalment of the paper above his head.
He then mimed using the copy to wipe his behind, stating: "That's the only thing that piece of s**t has been good for in 168 years."
As well as Cocker's dramatic News of the World protest, Pulp's T in the Park set included renditions of favourite tracks 'Common People', 'Sorted For E's And Wizz' and 'This Is Hardcore'.
The News of the World closed on Thursday following accusations that the paper hacked into the voicemail of phones belonging to murdered schoolgirl Milly Dowler and relatives of 7/7 victims.