The intelligence officers of Slough House, good at everyday profanity, are proficient infixers and interposers, too. An infixing, remember, is when one inserts profanity into the structure of a word, at a stress appropriate point (unfuckingbelievable); an interposing inserts the profanity between words in a fixed or idiomatic phrase (go to hell < go the fuck to hell). Infixings and interposings occur infrequently in speech, but when it comes to any variety of profanity, the slow horses are well ahead of the common herd.
Jackson Lamb infixes and interposes with abandon. As he points out to River Cartwright, whose grandfather had been a powerful spook in his day, “But no, you’ve got a grandfather. Congratufuckinglations. You’ve still got a job” (SH 37). The infixing drips with disdain for both grandfather and grandson, well-earned in the grandfather’s case — if you don’t already know that and why, then you really need to read the books.
Strong Language 
