16-year-old Kylie Jenner unleashed some pretty foul tweets Sunday night -- dropping words the young star should never say in public.

But, according to her, the nasty messages actually came from her older sisters Kendall Jenner and Khloe Kardashian.

Yeah, Khloe decided to have some fun at Kylie's expense last night, finding a moment of levity while dealing with her crumbling marriage to Lamar Odom.

So ... what'd she tweet? Well, we can't print all of the words on this website -- but here are just a few of the raunchy messages:

She also tweeted out things like "My d**k hurts," "Someone lick my b***s NOW" and "My t**s are so massive that they get in the way on twitter.... Who can relate?"

Khloe and Kendall copped to the hack in a video on Keek -- and it's the happiest we've seen Khloe in quite some time:

Sep 8, 2013 | hacked! by KendallJenner on Keek.com

What do you think? Funny, inappropriate ... or both?

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