The evil entity that comes to women once a month, resulting in said female becoming the biggest bitch of the best.
by Himawari Takami December 18, 2008
The oppisite of a superstition, a substition is the belief in something that is utterly true. Coined by Terry Pratchett in 'Making Money'.
When my mother told me not to pick at my scab or it wouldn't heal, I saw immediately that she was very substicious (believing greatly in a substition).
by Himawari Takami March 31, 2009