User blog comment:SnowlessWinter/Warrior's Amazing Ship Book!/@comment-1942179-20151031235133/@comment-27394009-20151101210625

Straight from Urban Dictionary XD:

A term used to describe fan fictions that take previously created characters and put them as a pair. It usually refers to romantic relationships, but it can refer platonic ones as well. (Just think of "shipping" as short for "relationSHIP".)