Definition

A person who habitually neglects responsibilities and prefers idleness and self-indulgence; someone who basically lunches their entire existence away with zero regard for consequences.

Example Usage

Ever since he retired, my uncle's become a total lunchout—he just naps and watches TV all day.

Source: Urban Dictionary (https://www.urbandictionary.com/define.php?term=lunchout&defid=7764)