Sunday church asshole.
Those who only go to church on Sundays with fancy clothes to see who they can meet there and look like good people. Not really interested in religion or being good guys.
-"Where's John? He never comes to play Tennis with us on Sundays."
-"He's a Sunday church asshole."
-"Bah, what an asshole."
-"He's a Sunday church asshole."
-"Bah, what an asshole."