from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A metasyntactic variable used to represent an unspecified entity. If part of a series of such entities, it is often the first in the series, and followed immediately by bar.
- interj. Expression of disappointment or disgust.
- n. fool, foolish person.
from The Century Dictionary and Cyclopedia
- n. See fu.
Circa 1935 as nonsense word, circa 1960 in programming sense. (Wiktionary)
Abbreviation of fool ("foolish person"). (Wiktionary)