wholesomememes

To "ship" is a term largely originating in internet fan fiction circles. It is short for "relationship" but usually means a non-canon relationship which the writer likes to imagine or portray two people being in. Typically chosen because the author believes those characters are a great match for each other despite no such relationship existing in the source material.

So this story is about how the best man used to always imagine as if the now bride-and-groom were in a relationship before they officially announced any relationship, or before they realised that they even wanted one themselves, because they seemed like such a good match.