Meaning: inserting a word into the middle of another word (e.g. abso-bloody-lutely, a-bloody-mazing). Wikipedia also discusses its technical application to classical languages and phrases.
Usefulness: 1 (Apparently this is an Australian tendency - I had trouble thinking of an example that didn't involve swearing, but am relieved to have a name for it.)
Logofascination: 1 (Besides being a handy Scrabble word, the source is fascinating. Tmesis turns up in the text of an unpublished epigram of Sir Thomas' - see below - discovered thanks to a terribly interesting and useful MetaFilter thread.* It's quite reassuring to discover that I'm not the only one so logofascinated.)
Usefulness: 1 (Apparently this is an Australian tendency - I had trouble thinking of an example that didn't involve swearing, but am relieved to have a name for it.)
Logofascination: 1 (Besides being a handy Scrabble word, the source is fascinating. Tmesis turns up in the text of an unpublished epigram of Sir Thomas' - see below - discovered thanks to a terribly interesting and useful MetaFilter thread.* It's quite reassuring to discover that I'm not the only one so logofascinated.)