Plork - Dutch acronym, stands for "Prachtig Lichaam, Onmeunige RotKop". Freely translated: "Marvellous Body, Terrible AssHead". Usually used to describe female, but, because the word is nonsexual, can also be used to describe a male one.
My friend, who studies electrotechnics, complained to me there are only plorks in his class.
This expression actually comes from a ZAP comic book (or similar clone). In one story the caped hero is strapped to a table and a luscious female is lowered onto his upright large member. A frame actually shows the entry, with the sound "PLORK!"