The “I’m Lovin’ It” marketing campaign is the longest-running ad in McDonald’s history, and Pusha T is one of the masterminds behind the iconic jingle, according to Rolling Stone.

Pusha T penned the jingle back in 2003, along with his brother Malice, Justin Timberlake and Pharrell Williams. However, Pusha T recently shared with Rolling Stone that he and Malice didn’t receive the compensation they deserved for the work, saying that they were only paid a one-time fee, and no royalties.

“I am solely responsible for the ’I’m Lovin‘ It’ swag and the jingle of that company,” he shared with Rolling Stone. “That’s just real. I am the reason.”

He went on to explain that he didn’t know better at the time, and he regrets the payout he accepted back then.

“I did it at a very young age at a very young time in my career where I wasn’t asking for as much money and ownership,” he told the publication. “It’s something that’s always dug at me later in life like, ‘Damnit, I was a part of this and I should have more stake.’ It was like half a million or a million dollars for me and my brother — but that’s peanuts for as long as that’s been running.”

Now, the rapper is firing back at McDonald’s by partnering up with competitor Arby’s. To help the sandwich franchise advertise its new spicy fish sandwich, Pusha T wrote a diss track that comes for McDonald’s neck.

Pusha T doesn’t hold back on the track, referencing his involvement in writing the “I’m Lovin’ It’ jingle and calling out McDonald’s own fish sandwich, the Filet-O-Fish.

“Filet-O-Fish is s**t/ And you should be disgusted,” he raps on the track that dropped on Monday. “A little cube of fish from a clown is basic.”

“How dare you sell a square of fish asking us to trust it?” the rapper continues.

No one does a diss track quite like Pusha T. The rapper took the hip-hop world by storm back in 2018, when he came for Drake in “The Story of Adidon,” Pitchfork reports.

“We had a good time [with ‘Adidon’], but I’m over it,” Pusha T told Rolling Stone. “I’m the first-ever fish sandwich diss ever, and I should go down in history for that.”