For length: 9" inches. And this is only possible because of downward curvature (i.e. upside down "U" shaped). We're not talking about straight as an arrow or upward curving erections. An upward curving erection can easily have 9" on the underside, but that measurement isn't valid to some because the pseudo standard of measuring says only topside counts. Even though, measuring the topside of a downcurve is the same as measuring the underside of an upcurve and vice versa. Also, as people above me have said, most people have no idea just how long 7, 8, 9" really is... let alone an object that is longer.
For girth: 7" or slightly less. Most people that have this girth attained it by pumping or some sort of injury. Also, they could have an extremely thick cock but not one that is simultaneously very long (and vice versa).
Abnormal sizes (i.e. greater sizes than the ones I mentioned above) only come from extreme pumping, silicone injections, elephantitis, etc. A lot of these practices are borderline self mutilation imo.
EDIT:
I'd like to know where you are getting the info to make the statement, "Just curious to see what others think because most people (about 70% - includes males and females) think it's anything over 10 inches."