It's not a rare thing for the Kardashian sisters to make fun of each other but a new teaser reveals that Khloe and Kourtney came up with a pretty hilarious way to gossip about Kim.

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In the clip, Kim was in the same room with Kourtney and Khloe when they started to slam a woman named Nancy. Kim had no clue they were really talking about her.

Kourtney said, "How annoying is Nance?"

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Kim instantly asks, "Who is this Nancy person?"

Kim went on to say that if Kourtney and Khloe know "Nancy," then she knows her too.

"I feel like I would really know who this Nancy person is, because I know everyone," Kim said.

Kourtney and Khloe continue on and say that Nancy is a mean woman who always criticizes everything they do.

Khloe said, "[She's] an annoying, judgmental hooker. She called me the other day just to critique stuff like how I look in photos and stuff I shouldn't wear."

Kourtney chimed in and said that Nancy does the same thing to her all the time.

In a private interview she said, "Khloe and I are having so much fun calling her Nancy because she has no idea who we're talking about. There's only so much our souls can handle when it comes to Kim with her criticism day after day. If she's gonna mess with us then we're gonna mess with her back."

Find out of Kim realized who the infamous Nancy was on the new episode of Keeping Up With the Kardashians airing Feb. 9 on E! on 9/8c.

Tags: Keeping Up With The Kardashians E! Reality TV