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1.
Little flat bread distributed in churchs.

Used as a swear in Quebec in the usual form of esti
1. j'ai mangé une ostie à l'église
2. Toé mon esti!
by soulvacuum January 06, 2005
 
2.
French-Canadian swear word. Related to the Catholic church.
Ostie que chu fatigue!
by PipFender December 11, 2010