Definition: Snake Bites, in my opinion, are named incorrectly because if anything, they're supposed to look like snake fangs, not bites. But what do I know? I'm not even sure where the term came from or how it recently became accepted terminology for a piercing that's basically been around for years. But in the last 2-3 years, I've seen a gradual spike in the occurrence of this particular piercing style and now both the name and the piercings are a hot item.
Snake Bites are really just lip piercings, but specifically it is two lower lip piercings evenly separated on each side of the lip's center. Typically, they're fitted with two CBRs which encircle the lower lip, but they can also be fitted with labret studs if you prefer. You have to decide how you want to wear your Snake Bites from the initial piercing, thouggh - it doesn't work to change back and forth from a ring to a labret stud, because the holes aren't pierced the same and the jewelry won't set right if you try to switch. I'm not saying it's impossible, but it could cause a lot of irritation and healing problems.
One thing to consider about getting Snake Bites is that you're getting two piercings at once. That tends to be a little more painful and more stressful on your body than just getting a single piercing. You also want to find a piercer who's really careful about lining them up properly, too, because if one is a little bit off center or higher/lower than the other one, it's going to look bad. Your piercer will probably make dots on your skin and ask you to look in the mirror and approve the placement - don't just look and say, "Cool!" You need to really look at them and make sure you are good with the placement before it's too late to turn back.
Examples: Like most lip piercings, Snake Bites are both external and oral piercings, so you have two types of aftercare instructions to follow to keep your piercing clean and healthy. Because they're so close to your mouth, eating and drinking is going to be sore for a few days. Your speech might be a little unclear while your lips are swollen. You should definitely stay away from cigarettes and it's best to stay away from alcohol, too, especially beer (something about the yeast, I can say from personal experience it is not good).