A Neologism
A neologism is a word that you (or someone) made up to fit a circumstance that doesn’t have a word. Here’s a pretty good example.
It’s a bit long, but it has a pretty good ring to it, and I think the definition is pretty good, too.
This kind of word is also called a portmanteau word: Two (or more) words combined to make a new word, in this case blunder and catastrophe.
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