Input (grade 11): As with many expletives, it can be used as an interjection or as many other parts of speech, and can carry a wide variety of meanings. Most commonly, it is a noun or interjection that refers to any use of misleading, disingenuous, or false language.
Output (grade 8): It can be used also as an interjection or as many other parts of speech, and can mean many things.