If you know that “to fuck” a person is to have sex with him/her, you automatically understand that a fuckable person is one that you would like to fuck. Accordingly is an unfuckable person a person that you don'
t want to fuck at all. A refuckable person is a person you would like to fuck again, while an unrefuckable person is one that you don'
t want to fuck again. You know the meaning of all these
words by virtue of your
knowledge of the individual morphemes fuck, re-, -able and un- and the rules for their combination.