Lucaceous is when your vetching (see vetch), on a 24-hour adderrol and Obama bender, smoking your 30th cigarette of the day, and you look into the half-open window across the alley and see your neighbor's big fat ass.
Person A: "Oh my GOD! I just saw my neighbor's big fat ass!"
Person B: "Man, that is lucaceous!"
(verb) To sneak into an Old Folk's Home and switch the oxygen/resperator tanks with the compressed fart-gas of thirteen Nebraska Ironworkers, then dressing like a clown and handing out fortune cookies with bible passages scrawled in red letters on the fortunes.
"No, I don't think that's wierd. My ex used to dongarent on thursdays at Willow Lakes, but he had to quit because of a Nebraska construction disaster ruined his fart-gas hook-up, and clowning around with bible-fortunes sort of lost its splendor I guess after that..."