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A barbed metal belt worn round the thigh of followers of Opus Dei, a Catholic sect. Used to recreate and remind them of the suffering of Christ at the crucifiction, and as punishment for 'sins of the flesh'.
Opus Dei missionaries have to wear it for at least 2 hours per day, except on the Sabbath and other holy days. - Pronounced 'SILL-iss'
Bob: Hey mate, where's John?

Pete: He's in the Hospital, tightened his cilice too much, didn't he?

Bob: What a plonker!
by Bexy.W June 02, 2006
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A hairshirt worn commonly be medieval monks designed to irritate the skin and shelter lice. They were worn to cause the wearer suffering as penance for sins and to imitate the sufferings of Christ on the cross.
Man #1:Yo, bitch, this hurr hairshirt is itchin the fuck outta me. Why the hell am I wearing this shit?
Man #2:What Would Jesus Do, Motherfucker?
by Billy The Impaler December 08, 2004
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