Here is what happened (I suspect it might be a bug, and I'd like it not happen again):
your account has been automatically suspended for posting inappropriate content and cannot chat for 29 minutes.
For those who have appropriate privileges, here is the link to the message:
Stéphane said (9:48 PM): Perso, j'ai adopté ⊆ pour l'inclusion large, ⊂ pour l'inclusion stricte et je slape tout individu qui fait autrement.
Stack Exchange deleted this message (9:57 PM)
In this message slape was a Frenchified slap. As far as I know, even in English, neither slap or slape could be considered foul language?
Why was this message considered inappropriate? Was it an automatic decision? A human mistake? A bug?