Noun: one who has a tendency to lunch things out (see "lunch"). One who wastes their days achieving very little and who loves idleness and self-indulgence more than they fear its consequences. Essentially one who lunches out their life.
"God, you're such a lunchout."
Verb, as in "to lunch out". Transitive: to neglect, lose, forget about or fail to do. Intransitive: to be neglectful, lazy, forgetful, probably due to being stoned or drunk. See also noun, "lunchout".
Transitive: "I totally lunched out my dentist's appointment/girlfriend/fags".
Intransitive: "He spent the day lunching out on the sofa."