Any two people that are insistent on either having their way or having something be what they believe to be right; usually behaving in a nitpicking manner over a matter that is generally perceived to be not that big of a deal.
Originally referring stereotypically to a couple of unhappy elderly women, but now to anyone who resembles the attitude. The name "Mary" is used as opposed to another name because of its
progressive decline in
popularity; resulting in more older people with the name than younger people.
The term is mostly known from its use in an episode of the The Office U.S.
Stanley, Michael, and Bob are waiting in line, with Bob being the foremost of
the three.
Bob's wife comes up to him and seems to try to
get in line with him to avoid waiting at the end.
Stanley and Michael see this and tell his wife to go to
the end of the line.
Bob then calls Stanley and Michael a "pair of Marys."