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A video posted by Kourtney's Snapchat (@kourtneysnapchat) on



Rob Kardashian is the worst!

We thought Kylie Jenner may have been the worst member of the Kardashian clan, but Rob K has just pulled through to clinch the title with a dirty and disrespectful conversation with his mother, which his sister Kourtney Kardashian posted on Snapchat.

In the video, Kourt says, "There's something so wrong with my brother, I just want you guys to know that."

The 29-year-old smiled wide and then said to his mother, who was on the other end of the phone, "Why don't you shove your d*** in my mouth?

Seriously WTF?!

Kourtney seemed to get a kick out of her brother's lewd behavior -- but we didn't find it funny at all. There really is something wrong with Rob -- we're so glad he's going to have a kid of his own. Good luck with raising that kid, dude!