A Fartcast is a video enhanced with fart sound overlays.
  1. Pick a YouTube video.
  2. Add farts at any point in the timeline.
  3. Enjoy & share.
Because, videos are better like this:

fart times:
curr play time:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_11_5) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/50.0.2661.102 Safari/537.36