By far the most versatile and flexible word in the English language, with endless meanings and interpretations, while capable of being used in all/any parts of speech (noun, verb, adjective, pro-noun, etc).
You can use it how ever the fuck you so please and the whole entire sentence will still make fucking sense.
1. (verb) lets fuck.
2. (noun) that dumb fuck over there.
3. (adjective) she ugly as fuck.
4. what the fuck?
5. we're fucked...
6. who knows where the fuck they went
7. shut the fuck up 8. are you fucking serious?
etc...
Typically the word you say for "Fuck me!" In a matter of sexual acts or some shit.
Another definition is "Fuck" for when you failed some shit, or fucked up something bad. Smh. For example,