from
Jargon File (4.4.4, 14 Aug 2003)
Bzzzt! Wrong.
/bzt rong/, excl.
[common; Usenet/Internet; punctuation varies] From a Robin Williams
routine in the movie Dead Poets Society spoofing radio or TV quiz
programs, such as Truth or Consequences, where an incorrect answer
earns one a blast from the buzzer and condolences from the
interlocutor. A way of expressing mock-rude disagreement, usually
immediately following an included quote from another poster. The less
abbreviated "*Bzzzzt*, wrong, but thank you for playing" is also
common; capitalization and emphasis of the buzzer sound varies.