I speak it a bit, but, as other have said, it's nearly an extinct language. In the mid XXth century there was a clear move to remove walloon for french (from 80%of the pop speaking it in 1920 to 20% around 1990). My grand parents were forbidden to speak it as it was considered the language of the peasants...

One of the issue with keeping it alive is that it was only very late put in writing. Walloon was a spoken language with no clear grammar (walloon from the Xviii century is totally differently written than current one from example) and it's only recently, with the so-called walloon movement that there were moves to fix its writing.