That's why when major bad-asses greet each other in movies, they don't say anything, they just nod. The nod means, 'I' am a bad-ass, and I recognize that you, too, are a bad-ass,' but they don't say anything because they're Wolverine and Magneto and it would mess up their vibe to explain.

Summary

This quote humorously highlights the tendency in movies for major tough characters to simply nod at each other instead of exchanging words. The nod signifies a mutual understanding and respect for each other's badassery. However, the quote playfully suggests that these characters, such as Wolverine and Magneto, don't need to verbalize it because their vibe and reputation speak for themselves.