(offensive, noun) to call one a cocokhead is to imply said person enjoys to indulge in the use of the illegal drug cocaine on a regular basis, as well as insinuating that said person also has the throbbing genitals of a gay man permanently attached to their forehead, like a some sort of freak of nature whom nobody loves
"you're such a cocokhead, get your filthy coke-covered head penis away from me!"