verb
fucks; fucked; fucking
Fuck is an extremely offensive word in all of its uses and should be avoided.
offensive + obscene
[no obj] :to have sex
[+ obj] :to have sex with (someone)
[+ obj] offensive :to cheat or mistreat (someone)
offensive - used to express anger, disgust, etc.
fuck off
[phrasal verb] offensive - used as an angry command to tell someone to go away;
fuck up
[phrasal verb] offensive
to act stupidly :to make mistakes
fuck up (something) or fuck (something) up :to ruin (something) by being stupid or careless
fuck up (someone) or fuck (someone) up :to cause (someone) to become confused, crazy, etc.
fuck with
[phrasal verb] offensive
fuck with (something) :to handle (something) carelessly :to mess with (something)
fuck with (someone) :to treat (someone) wrongly :to mess with (someone)
noun
plural fucks
[count] offensive + obscene :an act of sexual intercourse
[count] offensive + obscene :a sexual partner
offensive
[singular] :anything at all - usually used in negative statements
[noncount] - used with the as a way to make an angry statement or question more forceful
[count] US offensive :fucker