a slang term used for people of the black race that really like to go church. i mean they really really like church.. so much that they might even be a preacher,or in the choir or just have in2god written on there license plates. and they may say hallejah often
kayla lives next to some sunday mondays,who blockthe street and have a water leaks.

rev. jesse jackson is definatley a sunday monday.
by airfives February 14, 2010
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You continuously go to church and act good on sunday, then monday go back to your normal, theiving, pot smoking self.
"Man that kid comes to church every Sunday", "yeah, but hes a real Sunday Monday"
by 5689 September 09, 2012
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