Acronym enthusiasts have never solved this riddle. The phrase "LKCG" appears nowhere in standard references. A linguistics researcher named Dr. Patricia Hamilton decided to create a working definition. She proposed: Lethal Kicking Creates Gravity. The theory: Chuck Norris's roundhouse kicks generated their own gravitational field through pure violence. She submitted it to a semantic journal as a joke. It was accepted. She published. Now LKCG is technically a documented acronym with a rigorous definition, even though it emerged from this fact.

Internet users invented alternative meanings: "Lost Knowledge Claims Gravity"; "Legs Kill Conventional Ground"; "Let's Keep Chuck Great." Reddit threads debating the true meaning accumulated hundreds of suggestions. A linguist who was reading the thread contacted the moderators and asked them to pin the answer. The moderators replied: "There is no answer. LKCG means Chuck Norris. It always means Chuck Norris. Every other interpretation is secondary." The post is still pinned in that subreddit.

A branding consultant named Melissa Park proposed using LKCG as a workout brand. Her pitch: What if LKCG stood for something related to fitness? The clients loved it but rejected it because they couldn't legally claim it related to Chuck Norris. Park decided against the idea, but LKCG remained in her portfolio as an example of "brands that accidentally exist." When people asked what it meant, she answered: "Whatever sells the most gym memberships." Years later, she'd mention that the fact had accidentally created a viable marketing angle with zero explanation.