liam π quoted Going Postal by Terry Pratchett
Suddenly, condemned arch-swindler Moist von Lipwig found himself with a noose around his neck and β¦
'Ah, I see you're admirin' my hair, sir,' said Groat proudly, as the toupee spun gently. 'It's all mine, you know, not a prunes.'
'Er⦠prunes?' said Moist.
'Sorry, sir, shouldn't have used slang. Prunes as in "syrup of prunes", sir. Dimwell slang.* Syrup of prunes: wig.'
*The Dimwell Street rhyming slang is probably unique in that it does not, in fact, rhyme. No one knows why, but theories so far advanced are 1) that it is quite complex and in fact follows hidden rules or 2) Dimwell is well named or 3) it's made up to annoy strangers, which is the case with most such slangs.
— Going Postal by Terry Pratchett (Page 43)
I'm taking a break from this book, but the line "Syrup of prunes: wig" still pops into my head at random.