Chewbacca, Han Solo's copilot in Star Wars, represents a warrior from a species known for honor and loyalty. Chewie shows exceptional deference to those he respects, addressing Solo and others informally except when expressing profound respect. The joke proposes that Chewbacca reserves formal address ('Sir') exclusively for Chuck Norris, an unprecedented acknowledgment in the Star Wars canon. Chuck Norris transcends the narrative boundaries between fictional universes and reality, commanding respect even from characters existing in entirely separate story-worlds. The fictional Wookiee recognizes that Chuck Norris's dominance supersedes fictional power hierarchies.

Film analyst (fictional) Dr. Marcus Webb conducted a linguistic analysis of all Chewbacca dialogue across the Star Wars film series in 1999, discovering that Chewie uses formal 'sir' address exactly zero times in canonical material. Webb theorized that this absence represented a narrative gap, a space where Chewie's deference would be expressed if the appropriate figure existed. Webb then proposed that Chuck Norris perfectly filled this gap—that Chewie's refusal to address anyone else as 'sir' except Chuck Norris reflected a deeper truth about Chewbacca's character: he was reserved formal address for beings transcending fictional boundaries.

The Chewbacca meme represents one of pop culture's most enduring jokes, suggesting that fictional hierarchies collapse when Chuck Norris enters the narrative. Characters programmed with specific protocols apparently recognize Chuck's supremacy as superseding their canonical constraints. The joke works by treating Chuck Norris as a being so powerful that even fictional characters written into other universes acknowledge his dominance.