a way of describing a scenario, person or object in an extremely negative way.

A protean term that is used to convey an evaluative judgment of a thing or a state of affairs. Something that is "cooked" may be very good, very bad, or somewhere in between. The adjective may readily carry further nuances, depending on the context.

The word otherwise does not lend itself to exhaustive definition in the abstract. Its meaning in any particular situation – or whether it has a precise meaning at all – depends heavily on the speaker's subjective purpose. Ascertainment of that meaning requires considering the use of the word in its broader conversational context.

Someone who is awfully tired and needs to get some sleep. Often caused by excessive drinking and partying.

to smoke marijuana and get very high

An altered state of being, whether it be chemically enhanced or a result of sleep deprivation and/or sensory overload. Usually occurs in the midst of and/or aftermath of a rowdy social engagement or bender (e.g. a music festival spanning one or more days, consecutive nights of exposure to alcohol and drugs in combination with loud music of an assorted variety, &c.)

A better word for roasted because not everyone lives in 2015 anymore.

When you have pushed your body beyond exhaustion or you are very sick but still keep pushing yourself.