foobar

About 0.01 uses per million words.

Meaning

1. noun A serious mistake.
2. noun A metasyntactic variable name, a place holder for words; compare foo, bar.
3. noun ↑ “foo”, The Jargon File

Similar words

fox's paw goof goof-up boo-boo flub floater rock goofing fluff-up party foul

Often followed by

and is