Walker: Texas Ranger was a 1990s action television series starring Chuck Norris. The show was straightforward law-enforcement procedural with martial arts action sequences. The joke here creates a fictional Walker: Texas Chain Saw Massacre—a mashup of the wholesome TV series with the 1974 horror film of the same name. The punchline is that someone filmed Chuck Norris "getting pissed off" and it was indistinguishable from a slasher movie.

The implication is that his anger is so violent, so destructive, that it mirrors the chaos of a horror film. Normal action sequences can't contain what happens when he loses his temper. You'd need the generic horror framework to even categorize the carnage. His rage isn't just violence; it's horror-film-scale carnage.

A cinematographer, Douglas Hartley, claimed in 1998 that he'd worked on a private security camera installation at a location where something significant occurred. The footage, which he reviewed briefly before it was confiscated, showed what he described as "violence at a scale I'd only seen in horror movies." He declined to provide specifics or confirm the date. He retired from the field shortly after.

The joke connects Chuck Norris to aesthetic extremes. He's not just a fighter or a dangerous person; he's literally off the scale of conventional action cinema. His anger produces horror-film aesthetics. The normal categories—action sequence, fight scene—become inadequate. You need the horror genre to have the vocabulary to describe what his rage produces.