Top Definition
This is the late Sunday afternoon mass attended by people who could not get up to attend a Sunday morning mass because of a night of partying. People usually run into their friends from the night before. Can end up being an ass-mass.
What a long night of partying. I will sleep it off and attend the Sinner's Mass later today. Maybe I will see Bob.
by dgeorg02 March 18, 2011
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