The orange hairs are called pistilles. All strains have them, it's the preflower. You determine what sex the plant is with them. They come out in a V shape, and are white. The stay white during most of the flowering period but they start to colour over time and go orange, red, or purple depending on strain. Some strains have lots and lots of pistilles, and some have hardly any. Some may be cut off by the grower as he manicures the buds, but he'd have to be a crazy OCD to be that mitliculous.

Buds harvested to early will also have more pistilles because the flowering period is not yet fully complete.

Even if you harvest a plant late the pistilles will still turn orange / red / purple during the drying period before curing.

Like i said, i'd assume that the orange in "Orange Kush" referred to the amount of pistilles covering the bud. That's if there isnt an orange hue, or an orange after taste. I supose it could be many things or a combination of things.

OR, maybe it's just a name someone came up with and thought it sounded nice so he thought he couldnt make a nice bit of money on it.

Who knows. I sure dont.