A cup that is continuosuly used and never cleaned. Usually the cup is so dirty all sorts of germs and mold are highly visable, similar to what the aftermath of a blumpkin would look like.
Ever since the cafeteria started giving away free coffee my mug is starting to look like a Blumpkin Cup. I drink so much coffee I just have no time to clean it out each use.
by BSKabus February 09, 2010