a lazy fuck, usually does not contribute much if any to the sexual intercourse, acting more as a body there to be fucked, rather than as a buddy with which you have a good time fucking.
Dave: So I heard Sarah's your fuckbuddy, that true?
Mike: Yeah, well, she's more like a fuckbody, she goes face down ass up and makes me do all the work.
Dave: I hate that shit.
Mike: Yeah, she's supposed to be an active participant.