Roll Me Up -- Willie Nelson, Snoop Dogg, Kris Kristofferson, and Jamey Johnson
I could call this a breaking find, because I just heard about it, but Willie put this album out in 2012. I've tried a couple of times to describe how awesome this song is. There is only one way: Jamey Johnson, Kris Kristofferson, and Snoop Dogg are singing with Willie about smoking, and it's not tobacco. And it works.
You really just have to listen to it. I haven't laughed this hard for months.