Nick Cannon has more serious beefs than shading Kylie Jenner and Danielle Bregoli. Nick is nursing an 11-year-old grudge.

He's been feuding with Eminem since 2008, when the infamous rapper took cheap shots at Nick's then-wife, Mariah Carey.

More than a decade later, Nick is making it clear that he still feels that Eminem needs to be held accountable for what he said.

Speaking on T.I.'s podcast ExpediTIously, Nick Cannon opens up about his longstanding resentment towards Eminem.

He clearly doesn't like that the rapper never met up with him to settle things.

"He didn't wanna battle me," Nick observes.

He says that: "it could have went down."

"I was like, whatever he wanna do, I'm with it," Nick shares.

The feud began in 2008, shortly after Nick and Mariah had first married.

"I think we were flying back on a jet from Africa or somewhere," Nick recalls.

"And this motherf--ker drops a song, like, talking s--t," he complains.

Within that song, Nick accuses, Eminem was "Calling her [Mariah] all kinds of b--ches and hoes."

Well, that's enough to upset anyone, but especially her husband.

Nick recalls his furious response: "I’m like, 'this is my wife. This is my new wife.'"

"I wrote a letter first," he reveals.

A letter? We suppose that the telegram lines were down.

"I don’t even know if Twitter had come out yet," Nixk admits.

Twitter came out in 2008, but existing and being popular are not the same thing.

"So, I wrote this long-ass letter," Nick relates.

Within the letter, the content was "pretty much saying, 'look, I respect you as an artist.'"

That's a great way to get off on the right foot.

"'I’m actually a fan," Nick admitted within the message.

"And," he told Eminem at the time. "I think you’re one of the best ever to do it."

"But from man to man," Nick wrote. "You are talking out of pocket to my wife."

"You gotta be held accountable for that," Nick expresses.

Goodness. If this were ye olden times, Nick would have had to strike Eminem across the face with a fancy glove to challenge him to a duel.

"So," Nick recalls telling him. "I need to see you face-to-face.'"

He even says that he "went looking for" Eminem. Again, this is some straight-up feudal era knights-of-honor nonsense.

Nick even says that he would have flown to Detroit for this confrontation.

"I was like, look, if you wanna get on the phone, if I gotta go to Detroit," Nick recalls.

This guy was big mad.

"You done disrespected my wife," he explains.

Nick explains his extreme fixation: "I gotta show my wife I'm a man, number one."

Toxic masculinity ruins the party once again, we see.

"And two, he said my name," Nick notes.

Which summons him instantly. Like Beetlejuice.

Nick concludes: "I said, 'I know I'm not going to be able to out rap you, but I will whoop your ass.'"

Well, we'll say this much for Nick Cannon:

He has a very grounded and realistic estimation of his abilities.

It sounds like Eminem does, too, which is probably why he never went face-to-face with Nick to square things away.