dark ages
n.— «Dark Ages—Period between Christmas and spring break, when bad weather and no breaks make it the most depressing time of the year.» —“A look at the lingo used by the mids; Source: Brief Points: An Almanac for Parents and Friends of U.S. Naval Academy Midshipmen” in U.S. Naval Academy The Capital (Annapolis, Md.) May 22, 2005. (source: Double-Tongued Dictionary)