The story
Chewbacca (a character from the 1977 film Star Wars) + defense; coined in "Chef Aid", a 1998 episode of South Park.
Etymology from Wiktionary, CC BY-SA 4.0.
Chewbacca defense
Today it means: Any legal strategy or propaganda strategy that seeks to overwhelm its audience with nonsensical arguments, as a way of confusing the audience and drowning out legitimate opposing arguments. Full definition →