[Stanford: corruption of bar]
n. 1. The third metasyntactic variable, after foo and bar and before quux (or, occasionally, 'qux'; or local idiosyncracies like 'rag', 'zowie', etc.). "Suppose we have three functions: FOO, BAR, and BAZ. FOO calls BAR, which calls BAZ...."
2. interj. A term of mild annoyance. In this usage the term is often drawn out for 2 or 3 seconds, producing an effect not unlike the bleating of a sheep; /baaaaaaz/.
3. Occasionally appended to foo to produce 'foobaz'.