A product, or person advertised by the disney corparation. Often talentless, bad actors, bad singers. Some of them are whores ( Miley Cyrus) some are bimbos (Jonas brothers) They usually attract large amounts of pre-adolecent girls, and sometimes boys. Not to be trusted. Or liked.
John: Whos miley cyrus..?
Jane: only the stupidest disney star to grace the earth