Old World: A pony in the north of England was a mouthful of alcohol, about 30 ml. Hence today's modern term, a 'pony shot'.
As in: let me have a pony of that whisky.
New World: A poetry is the measure of the opacity of a report.
As in: did you read the strategy briefing for FY17? Must hit maximum poetry IMHO...
Bonus 1: Curious Measurements 1, a tumble
Bonus 2: Curious Measurements 2, a weary