The Guardian has a fun article on Susan Rennie's book, Roald Dahl's Rotsome and Repulsant Words, which is worth a read for all Dahl fans, and particularly lovers of his 1982 classic, The BFG:
If a small child were to walk up to the lexicographer Susan Rennie in the street and call her a slopgroggled grobsquiffler, she would know exactly how to reply. "You squinky squiddler!" she would shout. "You piffling little swishfiggler! You troggy little twit! Don't you dare talk pigsquiffle to me, you prunty old pogswizzler!" ...
If a small child were to walk up to the lexicographer Susan Rennie in the street and call her a slopgroggled grobsquiffler, she would know exactly how to reply. "You squinky squiddler!" she would shout. "You piffling little swishfiggler! You troggy little twit! Don't you dare talk pigsquiffle to me, you prunty old pogswizzler!" ...