Shipping is a Fandom term for when you think two characters from a item of fiction would make a good couple. For example if you think that Red and Yellow would make a good couple then you'd be called a SpecialShipper. If you'd oppose the idea of Red and Yellow being a couple you'd be called an AntiSpecialShipper. If you don't care about Red nor Yellow then you wouldn't be called anything. Shipping is short for Relationshipping.
To be added.