Star Wars: Episode III – Revenge of the Sith premiered in the United States on May 12th, 2005.
One of the scenes depict a Jedi Council being held, where at some point Ki-Adi-Mundi brings up the problem of a Separatist Invasion on Kashyyyk by asking “What about the droid attack on the Wookies?”.
The phrase was first posted as a meme on 4chan’s /tv/ board in December, 2015, along with a picture of Ki-Adi-Mundi appearing on a greenscreen set without CGI.
The quote, as well as the image would appear several times on 4chan in the following year.
“What about the droid attack on the Wookies?” would start emerging on Reddit in January, 2017, with photoshop edits and image macros being uploaded mainly to the r/PrequelMemes sub.
On January 22nd, 2017, EverythingPro™ uploaded the scene to YouTube.
An entry on the quote was added to Urban Dictionary on June 27th, 2018.