Cricket

Meaning: My favourite thing, but if you'd like a longer definition, the online Oxford says:

an open-air game played on a large grass field with ball, bats, and two wickets, between teams of eleven players, the object of the game being to score more runs than the opposition

Usefulness: 1 (if you talk about it as much as I do. I'm rather impressed I've done 77 posts without mentioning it here.)

Logofascination: 2 (etymology unknown, and about as many theories as people to ask: the Inky Fool talks about a possible connection to stool-ball, wiktionary features someone else's theory about Dutch origins, and there's a bunch more theories over at wikipedia.)

Bumdockdousse

Meaning: Urquhart's English name for pimpompet, which Cotgrave helpfully defines as "A kind of Game wherein three hit each other on the bumme with one of their feet." Later definitions call it an 'antick dance' rather than a game.

Usefulness: 2 (An incredibly apt metaphor for some meetings, although rather specific as to number. It lost points for sounding like a swearword, but could be useful as a swearword instead.)

Logofascination: 1 (a lovely example of how Sir Thomas worked: combining units - bum + dock (rump) + dousse (beat, strike) - to match the (non)sense and rhythm of the original.)