Don’t mess with Kourtney Kardashian, that’s all we have to say.

Jonathan Cheban has an interesting relationship with the Kardashian sisters, that’s for sure. They are clearly very close, almost like family — but that means they also fight like siblings do. In fact, on the February 18 episode of Kourtney & Kim Take Miami, Kourtney and Jonathan have such a huge blowout argument that it gets physical!

The obscenity-charged fight began when Jonathan called Kourtney to task for skipping out on some of her obligations to the sisters’ fashion labels. The two of them traded increasingly heated barbs, with Jonathan saying Kourtney’s only job is “collecting Kim’s money as it falls out of her a**,” and Kourt accusing Jonathan of ‘eating Kim’s dingleberries.”

Excuse us while we barf a little at the imagery this argument conjured. Why is everyone so obsessed with Kim’s behind? Wait, don’t answer that.

But the fight turned physical when Jonathan said, “Now I know why Scott’s never gonna marry you.” Kourtney slapped him right in the face, as hard as she could.

“That’s assault, brotha!” Scott later told her. It sure is! Lucky for Kourt, Jonathan eventually accepted her apology and didn’t press charges.