So you're watching South Park, and you want to see what it would be like if two of your favorite characters end up in a relationship. As you become more invested in your 'ship, you may start writing fanfiction, drawing fanart, and defending your 'ship against those imagined by other fans. Note that this is not necessarily bad, although it can be in some situations. Many shippers would admit to doing this to some extent; in fact, having your own interpretation of Canon is part of the fun of Shipping. However, it can become obnoxious when people try to force their ships on others.