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.