This is going to be hard to explain but it's worth a shot: Do you know that sound when people are playing guitar they do somethin' like a single strum and then it'll sound like it's sliding down the fretboard and then it'll just be muted or something. I've tried doing it but it sounds like crud.
Do you have any idea to what I'm talking about? If you can please help it's in a song I'm playing but I can't figure out how to do it.

Thanks in advance :D