I was drawn irresistibly to a thread abbreviated on the Forums Overview page as
Expressing Measurements Via Anal...
then I realised the abbreviation had fallen into a most uncomfortable and unfortunate place.
I want to dig out more information, but not all that long ago, the Jerusalem Post headed an article about an asteroid in near-Earth approach with a headline like "Asteroid the size of a dozen large walruses approaches Earth". I wondered if this was one of those old Biblical weights and measures you find in the detailed small print in Leviticus or Deuteronomy and maybe revived for everyday use in the modern world.
Apparently, this is a knowing joke thing with the JP, and the paper prides itself on making up unique and eccentric size and weight comparatives - there have been a few more since.