"Hump Day"....interesting phrase, rarely used in southern England but I think I get your drift there James.
As an optimist, I'm taking a view that Strelets are busy-busy preparing for a pre-Christmas release of a WoSS cavalry sets bonanza. In view of this, I am happy for a period of relative quiet so far as showings of new masters and sculpts are concerned. This can only be for the greater good:innocent:
I can't find exactly from where, but it originated in North America. Possibly derived from the idea of 'getting over the hump' as achieving a difficult task. As ever there are posts on the inter-web that claim definitive origins, but with no sources nor other evidence, putting it somewhere in the 50s or 60s (perhaps).
No doubt people from North America who look at this forum may have some more solid, etymological information.