To act crazy and not be able to stop. This can either be a bad or a good thing.

not focused, zoning out or in a daze, not on top of your game, passing up a golden opportunity

well basically its the most univeral word that could possible be used. It is derived from the D.C area but is used religously in Crofton, Md aka C-town. Its to as an adjective that decribes anything you want it to describe. The key to this word is that if you've never heard the word that MD represents then it will be hard for someone unfamilar with our culture to ever grasp the concept in which the person is using it. This definition is lunchin. Also it can be good or bad.

existing in a strange or hallucinated state, behaving erratically or hilariously: lounging

Derives its meaning from "out to lunch", i.e. not with it, not really there.

To be taking it extremely easy, being lazy.

1. verb used to describe senseless actions and often used when under the influence of green
derived from the streets of naptown