This nickname, "the Crystal Ship," is pretty self-explanatory. It's the kind of irreverent moniker that we would expect Jesse to come up with, but it just so happens that it might ring a bell for those who are fans of the long-running Fox sitcom Malcolm in the Middle, Cranston's most well-known credit before Breaking Bad.
In the episode "Dirty Magazine," which aired during Malcolm's fifth season, Malcolm (Frankie Muniz) becomes the editor of his high school's literary magazine. He runs into a moral conundrum when he's forced to censor an amazing story submission by the school's principal, Mr. Block (Kurtwood Smith). The name of that magazine? You guessed it: The Crystal Ship, an odd title, never given any context.
As easy as it is to imagine a Breaking Bad writer intentionally slipping in the obscure Malcolm in the Middle reference, it's worth noting that the inspiration for the RV's nickname may have come from a completely different place. "The Crystal Ship" happens to be the name of a 1967 song by psychedelic rockers The Doors, the B-side of their hit single "Light My Fire." While the tune was never used on Breaking Bad, the show frequently made use of eclectic musical selections — and perhaps our hypothetical writer took inspiration from lyrics like, "The crystal ship is being filled / A thousand girls, a thousand thrills / A million ways to spend your time."
Of course, there exists another possibility — that the Jesse-ism was pulled out of the ether, and no reference to Malcolm in the Middle or The Doors was intended. Given that we're talking about a series famous for its Easter eggs and hidden references, though, that doesn't seem likely.
