From Wiktionary, the free dictionary
From pew + -mate.
pewmate (plural pewmates)
- One who shares the same pew.
2007 July 29, Lawrence Downes, “The Pope Reopens a Portal to Eternity, via the 1950s”, in New York Times[1]:We’ll have to prod our snoozing pewmates when to sit and stand; they’ll have to rein in their zealots.