Wow, this article is a blast from the past -- I first heard the phrase "spaghetti code" back in the 1990's!
According to Wikipedia [1], the phrase has been around since 1978. And there's also ravioli code, lasagna code, spaghetti with meatballs code, and macaroni code.
[1] http://en.wikipedia.org/wiki/Spaghetti_code