A shipper is singlehandedly one of the most annoying fans of television. They are obsessed with the notion that two characters of a TV show or movie should be or will be together. These particular type of fans have no interest in the more pertinent aspects of the show, just the romance of the characters they are shipping.
ABC's "LOST", is a perfect example of this annoying trend. The Jack/Kate/Sawyer love triangle have generated many shippers that call themselves "Jaters" (Kate/Jack relationship) or "Skaters" (Kate/Sawyer relationship). The shippers are occasionally mentioned and somewhat mocked by "LOST" producers Damon Lindelof and Carlton Cuse.
A "ship" usually gets its name by pairing the first letter of the male with the female's name, or vice versa. I.E. Brangelina.
"I love Dr. Christian Troy and Lizzie together! I'm gonna be a Chrizzie shipper!!!"