A person who attends college not only for an additional year (making them a super senior) but a year after that. Sometimes a super senior-ing is acceptable if a person needs this year for major requirements (engineering). With a sixth year senior this is not the case, it is pure laziness or unwillingness or stupidity keeping them in college. Possible reasons include the subject having a severe difficulty with launching or because they thought they were so cool in college they are scared of real life where people may not know them. It can also be a way to hold off being called an alcoholic (which of course only counts once college is over).

When you eat dirt for the first time and leave your family to build a shack in the woods