<jargon> /sner'b*l/ Incorrect data introduced by transmission errors; any corrupted or uninterpretable data.
The word originated in a 1978 advertisement for a Mockingboard, which "makes frogs croak, princesses shriek, and martians zxnrbl."
"It's not misspelled on the original page. The Internet must have zxnrbled it on the way to you."
(1997-03-16)
Try this search on Wikipedia, OneLook, Google