Re: Smidgeon as a unit of length
I always heard it as 'a gnat's pisser' as in "he came within half a gnat's pisser of scraping the boss's bmw"
The concept seems to be very familiar though. I'd be fascinated at a book (or article) on such measurement units. RCH is new to me, but will become much used, I feel
Biting the hand that feeds IT
