You know those placeholder words used when writing tests or documentation for software programs? They are called metasyntactic variables, and today I picked up some brand new ones beside the usual foo, bar, baz, and qux: corge, grault, garply, waldo, fred, plugh, xyzzy, and thud (source). The last one is definitely a keeper.
struct Thud: Thuddable { ... }I remember the first time I was introduced to toto—the most used metasyntatcic variable in French programming literature—and made fun of how silly and immature it sounded; a shortsighted take in retrospect.