Soon after Samuel Johnson’s Dictionary was published in 1755, so the story goes, he was approached by a pair of prudish readers who commended him for omitting ‘improper’ words. Johnson, according to one account, replied to the women: ‘What! my dears! then you have been looking for them?’
Today you can find improper words in any good dictionary – but only the main set. Fuck is there, but not fuckish, fuckfaced, fuck-nutty, fuck my old boots!, or fuck the dog and sell the pups. You’ll see shit in the usual sources, but good luck finding shit-breath, shit factory, shit-squirting, shit out, or shit on the dining room table.* Regular dictionaries just don’t cover the remarkable range of taboo vocabulary, nor should they.
For this we turn to specialist slang dictionaries. These do not shy from obscenity but embrace it in all its mutable monstrousness (I say this as someone who loves monsters, and mutants). And the best slang dictionary in existence – it defines, expertly, all the phrases above and thousands like them – is Green’s Dictionary of Slang (GDoS). Last year it went online. If that’s news to you, prepare for a treat.