20 Things You Somehow Missed In Star Wars: Episode VIII - The Last Jedi
18. "Don't Join"
The slippery slicer known as DJ certainly made his presence felt in The Last Jedi during Finn and Rose's attempts to break into the Supremacy ship and shut down the tracker the First Order were using to chase down the Resistance, but he never actually explicitly revealed what those two letters stood for.
Though he did actually subtly hint at what his nickname really meant a few times during the runtime.
The first clue this stuttering codebreaker offered up could be found on DJ's hat, with a plate on that item of clothing actually containing the words "Don't Join" on it in Aurabesh.
And if you weren't able to spot that easily missed name hint during your many rewatches of DJ shockingly turning on our heroes, then listen closely to what the genius slicer told the two on the ship he stole from Cantonica.
"Live free. Don't join" was DJ's advice to the freedom fighters, a line that contained both his motto and alias.