Unknown whether this originated as the Joke Tango, Jive Tango, or named for it's inventor, James Tango.
"Did you see James and Alethea doing the Jango? They were fantastic and hilarious!"
Meaning someone who is of the Dark Side, with more literal meanings being 'dick', 'fool', idiot', 'jerk' and so on.
"Oi! Jango! You're in my seat!"