1. when high, usually high with marijuana.
2. The highest rating you can give something

The 3rd stage of being high (the 1st buzzed, 2nd high).
Reaching a level of being stoned, is usually achieved after smoking a good amount of weed. example, a few bowl packs, a blunt, a few joints, or a few bong packs. Easily the best feeling in the world.

When you claim to have been under the influence of drugs, but your really bull-shitting.

The act of getting extremely intoxicated from Keystone Light.

It just means being high on marijuana. Not all those other definitions that make it seem like your retarded. Now that said, being stoned to the BONE would apply to those other definitons

Being fucked (literally, emotionally and or psychologically)