[Projoy] Well if we're bringing out child abuse, I used to get called "You silly, twisted boy" (a Grytpype-Thynne line, I believe) by my dad, and my mum's go-to threat to make me behave was "I'll bash your face in", which I've discovered works on my own children (the empty threat, that is) :-)

Only boring people get bored Still wonder about the veracity of that one .. I have been known to say it to my own daughters

Sowing plums to catch medlars, which I haven't heard myself, but I've heard of it being used as a reply to "What are you doing, mummy?"

(Projoy) At work in the early '70s it was the Caprolactam Chorus.

C F F T B Short for 'Chock full fit to bust' after a particularly large meal.

[INJ] Or in my family, fair boakin' fu'.

Penolopy jolly This means bottom, backside, arse, bum, derrière etc. and is derived from the Welsh pen ðl (same meaning) and the fact that my mother had had a friend at school called Penelope Jolly. The jolly was optional and sometimes Mum used simply the Welsh term on its own. Thus; "Oh, did you hurt your penolopy?" We had a number of these Welsh-derived words at home. This one was in frequent use but is untransferable, you could say.
(INJ) In our family it was just the last three letters, which my mother would half-heartedly claim meant "Full to the brim". Such a lady!