i called a bunch of people wiggers once...got it all wrong..i thought it meant people who like 'wig' out.... seriously....
I suppose that, or people who consistently wear wigs (Like the founding fathers of the U.S.) would be the only non-racist way of using that.
Race exists, but its a social construct and the result of incorrect thinking that different races of people evolved independently in different regions of the world. The idea of race still exists in society though. We are all part of the human race, but when somebody asks you what race you are, you know what they mean.
P.C. is a term people only tend to use when they are intolerant to some degree and are down on others who are for it. The p.c. term for a p.c. person is "tolerant."
Wigger obviously has racist roots and is a term for a racist state of mind. I'm pretty sure there isn't a set style for black people, that is limited to black people (well, I guess FUBU kind of is). It seems like a term of intolerance that judges black people as lower in some way. To me it seems like somebody might as well say "He acts like such a ni**er (sorry, I really don't like even typing that word)." when they say that.
With that said, I don't think that you necessarily are racist if you use that word. It was popularized by racists for sure, but overtime I think it has been accepted and used by people who don't realize the connotation of what they are saying. Somebody might say a kid in a ghetto gown and a new era hat is a wigger, just because that has been the way people characterize that style. But that is why discussions such as this one are good. When you talk about it, people realize what they are saying means, and how others feel about it. After that point it does become a conscious decision, and using it becomes racist.
Speaking of etymologies, did you know that the term "cracker" when used on white people does NOT originate from the idea of something that is white and has no flavor? It is actually the shortening of "whip-cracker," a reference to slavery ownership. Seems a little more intense of a thing to say once you know what it means.