I think we had this “name the acronym” once before
EJMR is the Economic Jobs Market Rumors social media forum, a sort of Linked-in for economists seeking jobs in the economics market. Its primarily focused on teaching jobs for academics but spans the entire economics/statistics and finance disciplines. While its a year-round online venue, its activities peak in December and early January prior to the annual January meetings of the American Economics Association where a large percentage of the economics hiring process occurs.
Having provided a totally useless factoid, I’m sure our CR poster going by that acronym has something else in mind.