Underwater basket weaving is an idiom referring in a negative way to supposedly easy and/or worthless college or university courses, and used generally to refer to a perceived decline in educational standards. The term also serves as an intentionally humorous generic answer to questions about a college degree. It is also used to humorously refer to any non-academic elective course, specifically one that does not count towards any graduation requirements.
via Underwater basket weaving – Wikipedia, the free encyclopedia.