"you go girl" origin

I know this is fairly recent and American but I think it must have emerged while I was in the UK. Is it connected with a televison show? Any ideas?

Thanks

Camel

It goes back to at least 1985. I found a site that mentions a Tennessee walking horse by that name (as the dam of another horse).
members.tripod.com/ ~FlyingHorseFarm/UMFSD.html