1. A Catholic priest. 2. A zealous Catholic worshipper. From missal (the Catholic book containing the text of prayers, chants, responses and the like used in the Mass) + monger (dealer or broker).
Father Mike is quite the missal monger, he really had folks fired up with that service on Sunday.
Noun: Yeah, kind of exciting. I'm adding a new definition to the urban dictionary right now. A content monger, so a content monger is a creator who produces large quantities of content for the purposes of gaining large numbers of likes, shares, subscribers,and monetization at the expense of factual content, quality And ethics.