A ship is a large vessel that floats on water. They serve a lot of purposes - they can fish, serve in warfare, be around just for the helluva it, etc. But 你 better watch out if 你 have a ship, because it might be commandeered 由 Jack Sparrow.
Or, ship is a fictional couple that a 粉丝 wants to get together, 或者 is together. It's just a pairing that they love. Ship could also be used as a verb, though. Like: I ship Huddy!
Ship means two things. First. it's what r-pattz said. And if you're talking about TV 或者 movies, it's a couple 或者 a character that 你 prefer. Like if I say I ship Damon and Elena in The Vampire Diaries, 或者 Ron and Hermione in Harry Potter, this means I like Damon and Elena and Ron and Hermione. If I say I ship Katherine Pierce 或者 Hermione Granger. It means Katherine Pierce and Hermioen Granger are my 最喜爱的 characters. Hope I helped.