I can't really describe skunk odor. The funny thing is, I don't think it smells bad at all from a distance. But once, when my sister and her husky mix was living with me, a skunk gave her dog a warning shot on his muzzle. It wasn't a full blast, but even that little bit smelled REALLY foul. Fortunately, the skunk wasn't harmed either.
You seldom see skunks as a rule because they're nocturnal. The one I mentioned above who startled me when I was out with my rabbit was the only one I ever saw in the light- and it was close to dusk. And when they ARE out during daylight it's even more scary- because that's abnormal behavior, which can mean the skunk is infected with rabies.