Cocozza confirmed rumours of a fling with the MTV personality back in October, announcing on an episode of The Xtra Factor: "I met her and... I banged her."
Speaking for the first time about her encounter with the Brighton-born teenager, Hagan declared that she was "really annoyed" that Cocozza had revealed all on live TV.
"To be honest, I'm trying to forget about it because it wasn't great," she recalled to the Daily Star. "I told the girls he was a four out of ten in bed. It was far from the best sex I've ever had and there's no way I would go back for more.
"I got offered a lot of money to sell my story at the time but didn't out of respect for him and his family and then he blurted it out on live telly on Xtra Factor and humiliated me. I was really annoyed but I know what lads are like. He was trying to act the big 'I am'."
Hagan went on to claim that she suffered "a lot of abuse" from Cocozza's admirers after he exposed their affair.
"I don't want to slag him off or do what he did to me and belittle him," she said. "But I did get a lot of abuse on Twitter at the time from girls telling me to back off Frankie.
"People were calling me a slag and saying Frankie was theirs, not mine. The only good thing out of the whole thing was I got an extra 9,000 Twitter followers."
After hearing of the Geordie Shore star's less-than-glowing review, Cocozza took to the social networking site and wrote to Hagan: "4/10.. Personally thought it was a great performance, especially after the third round. I need practice."
The Middlesbrough native responded by trying to distance herself from the comments, telling Cocozza: "Aw you know how the papers twist things! It was said as sarcasm in an interview, you know what its like x."
Geordie Shore returns January 31 on MTV.
Watch Digital Spy chat to the Geordie Shore girls below: