Idiolect or more widespread?

[Seán Fitzpatrick]

My daughters were discussing a forthcoming movie, and the 21-year-old said
you had to give the auteur credit for originality, since the movie was "not
based off a book, not based off another movie, and not based off a TV show".
"Based off" seemed to me to be a peculiar alteration of "based on".  The
strange thing is that she denied having said "based off" instead of "based
on". 

Seán Fitzpatrick
Pro-Child/Pro-Choice =
Pro-Pig/Pro-Bacon
http://www.logomachon.blogspot.com/

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The American Dialect Society - http://www.americandialect.org