I have looked up the wikepedia definition and not interested in discussing its origins. My question relates to common uses of this particular word. It seems that it can be used as a noun, verb, transitive verb, adjective, etc......but I have also heard it used in such a way that it is actually inserted into another word so that it sort of underscores the importance or severeity of the word in which it is inserted. (in-f*cking-credible; un-f*cking-believable) I can't think of another word that does this (at least not quite as well) and I wonder three things about this particular phenomena: is this just a Texas-sim; if not, how did this come about; and is there an actual grammatical term to describe this?