Until this post, "vamoosing" was a hapax legomenon in the Althouse archive.

And until this sentence "hapax legomenon" was a hapax legomenon in the Althouse archive.

I'd never used the word "vamoosing" (or "vamoose") in the entire 14-year archive of this blog until I used it in the previous post— which I did mainly for the alliteration with "value," but also because I really like it — it has a moose! — and had simply never thought to use it before.

I learned the term (and the concept) "hapax legomenon" reading Bryan A. Garner's "Nino and Me: My Unusual Friendship with Justice Antonin Scalia":