Ooooooooooooo kay.
I presume by your Bull Shannon-esque impression that you disapprove. That's fine, I just thought it needed to be said.
I don't dissaprove, and it would be irrelevant if i did. It just occours to me that Rifftrax has been doing great things over the last few years and it would be a shame if the guys started censoring themselves.
If you want dirty riffs, there's lots of stuff in the iRiffs section labeled "explicit content" that might appeal to those sensibilities. The one for The Lizzie McGuire Movie is supposed to be pretty randy.