back to speculation on falling into things.....in some parts of the world, women are referred to as "falling pregnant" (when they do, that is)

Sue was entered for the gymkhana but she had to drop out when she fell pregnant.

which reminds me of another unfathomable phrase: up the duff.

Or....hmmmm. Should I be posting this on the "British slang" thread?!

I've never heard of anyone 'falling pregnant' before so it must be a very localised term. Sounds almost North American. I've only heard 'became' or 'got' or 'made'. Always along those lines.

Up the Duff. There is a cake/pudding common in Blighty known as a plum duff. When baked it rises due to the yeasty content so the term 'up the duff' could be akin to the more common term 'bun in the oven'. I've never heard of duff being used as slang for buttocks but I'm guessing that the slang word was derived last. Anyone got any further thoughts??