What is the song playing in the background?

This sounds a little strange but I need to know what this song is. I
know it but cannot think of the name.
http://www.youtube.com/watch?v=nyORo0krTbw

The song is playing in the background and its kind of hard to hear and
its only a guitar but if you could please listen and tell me if you
know what it is it would be awesome. The video is a little
inappropriate because it has someone smoking in it. and please dont
make any comments on smoking weed, I know.....