One for the Scrabblers: tmesis —
separation of parts of a compound word by the intervention of one or more words
For example, un-f****ing-believable!
First used in 1550.
@Miraz I absolutely love this and thank you for sharing it! I imagine that examples of tmesis will now start to pop up everywhere, now that I know the word.
@martinfeld It’s cool, eh! I came across the word a few weeks back and instantly forgot it. So, when I found it again I knew I had to note it. 😀