I have done this position with my boyfriend several times. It is possible!!
Did you see those two lesbians doing double doggy style with that big pink dong?
The pre-pubescent fools above me should keep posting about movies and their friends from school because they clearly know nothing about sex.
'Snarkys' definition could possibly be considered valid, but I think 'double doggystyle'(if it did exist) would be a double penetration in the 'doggy' position.