'Off of' is considered bad English in the UK ....but is used in the States
see the following
Avoid the phrase 'off of' at all costs."
Source and further information:
http://mercury.tvu.ac.uk/~alan/grammar/howlers.html
Read more: Is it bad grammar to use 'off of' anywhere within a sentence? | Answerbag http://www.answerbag.com/q_view/707088#ixzz0v0ujwDzu
Off of
For most Americans, the natural thing to say is “Climb down off of [pronounced “offa”] that horse, Tex, with your hands in the air”; but many UK authorities urge that the “of” should be omitted as redundant.
http://www.wsu.edu/~brians/errors/nonerrors.html
But then there is always poetic licence...