Berkeley Quality Software adj.
(often abbreviated `BQS')
Term used in a pejorative sense to refer to software that was
apparently created by rather spaced-out hackers late at night to
solve some unique problem. It usually has nonexistent, incomplete,
or incorrect documentation, has been tested on at least two
examples, and core dumps when anyone else attempts to use it. This
term was frequently applied to early versions of the
debugger. See also Berzerkeley.
Note to British and Commonwealth readers: that's /berk'lee/, not /bark'lee/ as in British Received Pronunciation.