Hopium is the forward-looking sibling of copium. Copium explains why the loss is not real; hopium explains why the recovery is coming - a catalyst, a partnership, a bounce that has to happen at this level.
The tell is that the reasons arrive after the position is underwater and are never specific enough to be wrong. See hope-as-a-strategy for the same behaviour described without the joke.
Related: copium, hope-as-a-strategy, bag-holding-psychology, denial