hairball: n. 1. [Fidonet] A large batch of messages that a
store-and-forward network is failing to forward when it should.
Often used in the phrase "Fido coughed up a hairball today", meaning
that the stuck messages have just come unstuck, producing a flood of
mail where there had previously been drought. 2. An unmanageably
huge mass of source code. "JWZ thought the Mozilla effort bogged
down because the code was a huge hairball." 3. Any large amount of
garbage coming out suddenly. "Sendmail is coughing up a hairball, so
expect some slowness accessing the Internet."