To describe anything that is abnormally large. This definition derives from describing an animal that could consume a person because of its size like a shark or other carnivore. The adjective can be applied to anything.
Retarded people who update thier facebook status every 5 fucking seconds saying how they have the most amazing bf/gf when they really have only been dating them for 2 goddamn weeks.
when someone says that you are smoking SideWays, that usually means that you're mind isn't clear and that you are getting annoying, crazy, or they simply don't agree with you.