Ruin, botch, spoil. For example, Don't tell me you're going to fuck up again. This vulgar usage dates from the early s but did not become widespread until about Act carelessly or foolishly, mess up, as in I'm sorry, I really fucked up when I invited them.
Q From Heres Snijder, Canada : I remember someone telling me once, long ago, that actually the F-word is an abbreviation. The last two letters of the word were, I believe, contracted from the words Carnal Knowledge. Could you help me out here, perhaps with some additional etymological data? A Fuck , the most-used item of vulgar slang in the language and still one capable of shocking even in these linguistically tolerant times, has always fascinated the know-alls of etymology, especially those who see acronyms everywhere. If you hunt about you will find quite a number, all variations on a theme:.
Johnson also had excluded the word, and fuck wasn't in a single English language dictionary from to Houghton Mifflin followed, in , with "The American Heritage Dictionary," but it also published a "Clean Green" edition without the word, to assure itself access to the public high school market. Written form attested from at least early 16c.
Fuck is a profane English-language word  which often refers to the act of sexual intercourse but is also commonly used as an intensifier or to denote disdain. While its origin is obscure, it is usually considered to be first attested to around In modern usage, the term "fuck" and its derivatives such as "fucker" and "fucking" can be used as a noun , a verb , an adjective , an interjection or an adverb.