Monday hammer
 n.— «If they couldn’t get it undone with that, we used a flogging spanner and a “Monday” hammer. This was so called because it weighed 28lbs, and if you used it on a Monday, you were on the sick for the rest of the week!» —“Re: Hire or Beg Steal or Borrow…” by Learner Turner Ask The Trades (U.K.) May 19, 2004. (source: Double-Tongued Dictionary)

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