I would say that “you fucking fuck” is an appositional phrase consisting of just a subject (“fucking fuck”, in which “fuck” is a noun modified by “fucking”), emphasised by the appositional pronoun “you”. Similar to “you despicable nincompoop”.
Meanwhile, I don’t see that the subject of the first part is obvious. It seems to be a sentence in which the subject is implied. Something like “may <the situation in general> fuck you.”