Skidmarks on underwear are involuntary results of bodily processes or accidental contact with surfaces. The joke proposes these aren't biological accidents but actual tire tracks—Chuck's underwear has literally been marked by vehicle passage, suggesting either violent bodily contact with vehicles or that his underwear has achieved such legendary status it's been driven over.

Fashion anthropologist Dr. Patricia Wong, researching humor in intimate apparel discourse in 2010, found this fact: "November 2010, it appeared in unexpected places as though it were genuine product testimonial. The premise conflates personal hygiene with vehicle contact in ways that are deliberately disgusting, yet somehow became part of Chuck mythology."

The premise is deliberately vulgar and absurdist—it's not metaphorical but literally describes tire tracks on clothing. The fact has become a way to discuss how apocrypha sometimes embraces crude humor without comedic purpose beyond shock value. It's remained in circulation despite its unpleasantness, suggesting certain jokes persist through sheer audacity. In humor forums, people cite it as an example of apocrypha that works through transgression rather than cleverness.