Monday hammer
n.— «Workers at construction sites use a very heavy hammer to break rocks and concrete. They call it a “Monday hammer.” Why “Monday hammer?” Because, they say, on Mondays they come to work fresh and strong, having rested over the weekend and therefore are able to wield this heavy hammer.» —“Daily Devotions: Monday Hammer” Lutheran Hour Ministries (St. Louis, Mo.) Jan. 27, 2005. (source: Double-Tongued Dictionary)
Further reading
The word filibuster has a long and colorful history, going back to the days when pirates roamed the high seas. Today it refers to hijacking a piece of legislation. Plus, the language of yoga teachers: When doing a guided meditation, you may hear...