Expletive infixation

Expletive infixation is a process by which an expletive or profanity is inserted into a word, usually for intensification. It is similar to tmesis, but not all instances are covered by the usual definition of tmesis because the words are not necessarily compounds.[1]

The most commonly inserted English expletives are adjectival: either participles (fucking, mother-fucking, freaking, blooming, bleeding, damned, wretched) or adjectives (bloody).