Someone who lacks education, experience and expertise, especially if they overestimate their own competence.
Someone whose behavior would elicit the question, "are you new?"
The implication being that they have just been born, feet first, and they are still wearing their mother's snapper as a hat.
"Did you hear about these dudebros who just dropped $80k on a new website domain and think they're going to rake in 8 figures in the first year, having done zero market research? What a pair of snapperheads."
This person is close to legendary status, he is typically a smooth talker, and in order to have assumed the mantle of Snapperhead status, said Snapperhead must have engaged in some form of 4some (more than a foursome is typical and certainly acceptable, and definately awesome).
If Hugh Hefner was Australian, he would be the ultimate Snapperhead - legendary, definate smooth talker, and highly likely to have engaged in atleast a 10some (9chicks and one Hef).