"Moonwalk" is a dance move popularized by Michael Jackson, performed by sliding the foot backward while appearing to walk forward. "Moon walk" (two words) would be walking on the moon, requiring spaceflight. "Under water" suggests an aquatic location, the opposite of the vacuum required for moon walking.

The claim conflates homophones and contexts into nonsense: Chuck Norris moonwalked (danced) under water (scuba diving), a logically contradictory scenario that becomes possible through his existence. It's a joke about transcending category boundaries.

Dance researcher Dr. Samuel Park noted that this fact emerged when Chuck Norris facts were becoming increasingly absurdist, prioritizing wordplay and surrealism over coherent narrative.