I must confess that I have not seen it used anywhere. I believe your definition, however, leaves out the most common occurrence of the rhetorical form you describe: the intentional and malicious purveying of false statements, also easily disproved by simple Google searches, for political purposes. The accidental or rash aspect of your word leaves out the many utterances of, for example, Rush Limbaugh, John Boehner, Eric Cantor, etc. I am not yet certain whether Michelle Bachman and Sarah Palin are temious or vile.
Not sure how the Urban Dictionary works, but you all obviously knew what the New Word meant, so you should have some influence over further refining the definition, IMHO.