The chicken isn't the only thing heating up at two major chicken fast food joints. KFC has filed a copyright infringement lawsuit against Church's Texas Chicken over the use of the term "original recipe."

A few weeks ago, Church's decided that they wanted to run a marketing campaign to rustle up some business. With that, they decided to take things back to their roots, bringing back their own original recipe.

Church's hit the campaign trail and starting advertising that their "original recipe" was back.

Here is the issue: Colonel Sanders himself (KFC) has had that term — the two words "original recipe" — in-use since 1972. It was trademarked in 1984.

You know, those coveted KFC 11 herbs and spices that nobody really knows any details on.

The lawsuit was filed in Texas. In court documents, KFC says they sent a letter to Church’s on Oct. 24 objecting to their use of "original recipe," stating it infringed on KFC’s trademark.

The document goes onto show that Church's ignored the letter and continued using the phrase like it was nobody's business. The suit alleges "willful and in reckless disregard of KFC’s legal rights."

Those harsh words aren't chicken scratch — they are spelled out in great detail and get even harsher. Here are the fightin' words:

"Purchasers and prospective purchases who are disappointed with (Church’s) products and services are likely to attribute their dissatisfaction to KFC."

Mic drop for KFC on that one. The chicken brand is asking for unspecified monetary compensation and for Church's to cease use of "original recipe" in all ads and slogans moving forward.

34 'Yellowstone' Facts You Probably Didn't Know

How big of a fan of Yellowstone are you? These 34 facts about the Paramount Network show are sure to stump even the most dedicated viewers. They're almost all about the cast members and their real-life passions and roles.

The real-life marriage? Who has the most kills? Who told Taylor Sheridan "No"? These have all been added before Season 5 of Yellowstone resumes on Nov. 10.

John's kids? Beth's accent? Rainwater's guitar playing? Tate's spoilers? They're also included on this list of 34 Facts You Probably Didn't Know About Yellowstone.

Gallery Credit: Billy Dukes

The 20 Saddest Country Songs of the 2010s

Gallery Credit: Carena Liptak

Jelly Roll: 25 Stunning Facts About the 'Save Me' Singer

Jelly Roll is country music's most fascinating character. His life has taken dozens of wild twists and turns, and he's been honest about all of it. Here are 25 facts about the "Save Me" singer and his family.

Gallery Credit: Billy Dukes