This word has transformed the English language. While at one time considered nothing more than a swear word, and still is, it has become a descriptive term in urban culture. While not used by kids, it is as adults to describe as you say, almost everything. I read an article some time ago about the word, and apparently it is the most versatile word in the English language. Its used as a verb, adjective, noun and adverb. And can mean good, bad, like, dislike and everything in between. So true, its a word you don't learn in English class, but one in which you will encounter more often than most !