Does what it says on the tin. This is a thread where you talk about the ships you have. Melissa and Mike? Mercy and Kaz? Gambler and a chair with a pretty blonde wig on it?
Just a footnote, though, follow the site rules. Keep drama out of this thread, don't judge people and/or be an asshole, and I'd take it as a kindness.
FYI, for you non-tumblr-savvy folk, shipping refers to imagining two characters in a relationship.