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An oppressive person or dictator who forces, badgers, cajoles, or coerces other people to attend Catholic Mass.
Weekend houseguests at my father in-law's home realize early Sunday morning that he is a raging Mascist.

Not content to attend church alone, Robert resorts to his old Mascist tendencies.

My boss is such a Mascist that he always tells me on Friday that he looks forward to seeing me at the early service on Sunday.
by Buzz Writeyear February 05, 2008