I agree with Mike, I think Jim in clever enough to get the message across without filling his songs with bad language and graphic "images". Thinking about it, whilst Jim's music is very dramatic and creates a very clear image, there's very little (if any) bad language, be it in Meat songs or anyone else's.
I don't think any editting would have come from Meat - he was happy to tell us he can barely fit his dick in his pants!