Gon> (Sun, from aviation) A user' s misconfiguration or misuse of a piece of software, producing apparently bug-like results. E.g. "Joe Luser reported a bug in sendmail that causes it to generate bogus headers." "That' s not a bug, that' s pilot error. His "sendmail.cf" is hosed." Compare UBD. [JarGon File] (1994-12-05)