Specifically, "bleen" means "blue before January 1, 2000 and green on or after January 1, 2000". See also grue.
... 1987 The Guess Who[?] 1989 The Band 1990 Maureen Forrester[?] 1991 Leonard Cohen 1992 Ian and Sylvia[?] 1993 Anne Murray 1994 Rush 1995 Buffy ...