It's a two-part joke:
1) The video talks about forking code, pair-programming with spooning, and knifing (pull requests): fork, spoon, and knife. I just wondered if they have a chopsticks version, for people who prefer using chopsticks.
2) Then I realized there is already a context that involves pairing and chopsticks: Chopsticks is a common piano duet. Of course, it doesn't have to be played by two people...
http://www.youtube.com/watch?v=-Q_0N79afqU
(The video begins with the version you typically hear kids playing, but then, well, you have to watch!)