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1.
A pseudo-les, always young and middle-class.

Best if she is actually going to college, but the term applies to any young, middle-class female who is just passing thru the lesbian experience.

Extra points if she angles for reactions from straight men. This classic c-m-d puts tongue to pussy for the thrill of telling her boy acquaintances.

Eventually the boys lose interest, so the c-m-d starts supplying actual pussy. She has moved on in life.
"She said 'my girlfriend' five times in a thirty-word sentence. Oy, dot's a collegiate muffdiver!"
by C. T. May May 11, 2010