Farrah Abraham doesn't exactly get along with the other girls on Teen Mom OG.

But then again, if you have eyes and ears and have found yourself on parts of the internet that discuss Farrah Abraham, you already know this.

She and Amber Portwood used to be friends, but they became enemies after Farrah dared to point out that Matt Baier is a giant, good-for-nothing creep.

Amber didn't appreciate it, and she even tried to throw a swing at Farrah over it.

She and Catelynn Lowell haven't been getting along either, and Catelynn takes every possible opportunity to slam her somehow.

But, if you can believe it, the feud between Farrah and Maci Bookout predates all of these spats.

Remember, when Teen Mom first returned to our televisions, Farrah wasn't involved. When producers brought her back mid-season, Maci threatened to quit the show.

The issue, she said, was that she didn't want her son to share screen time with a porn star -- which, hey, that's her prerogative.

Though Maci eventually gave in, she and Farrah have been catty towards each other ever since.

To this day, really.

During one of her many birthday parties, Farrah was approached by In Touch, and she was asked about Ryan Edwards' newly revealed drug issues.

Specifically, she was asked about the Teen Mom OG scene in which Maci tearfully revealed to Amber and Catelynn that Ryan's drug use had gotten out of hand.

"Everyone else around him is too afraid of what it will look like more than his health," Maci explained on the show.

"I'm just sick of cleaning up his mess. I get tired of dealing with the sh-t. Just being the only one that f-cking sees everything and cares."

It was a sad scene, one of the most intense things we've seen on the show in a while.

But Farrah didn't see things that way.

"Who is she to talk about someone else's substance abuse when she's like an alcoholic?" she wondered.

Shots fired.

There are many Teen Mom OG fans who suspect that Maci may have a drinking problem -- she's often seen with a beer in her hand in her scenes.

There was also a widespread theory that she was drinking throughout much of her pregnancy with her third child, Maverick.

The "Maci is an alcoholic" went on for so long that she even confronted the rumors in her new book.

"Folks I am an adult, over the legal drinking age, and just because I'm a mom that doesn't mean I can't enjoy a beer on a Sunday evening with my husband," she wrote in one section.

"Newsflash: Mothers Are Human Beings. We are flawed, hard-working, well-intentioned, exhausted individuals; we do our best, we make mistakes, but above all we love our children."

She wrote that "obviously I don't condone excessive drinking," but "having a beer -- or even smoking the occasional cigarette -- does not warrant a call to Child Services, and it does not make you a bad mother."

So if she even bothers to respond to Farrah, it looks like we'll be in for a fun new chapter in the never-ending saga of Farrah vs. The World.