When using the words "cock" or "prick" singularly are just not strong enough to describe how utterly stupid somebody is.
Person 1: Hey, did you about Dedrick, he got caught trying to break into the White House in broad daylight while wearing his "I'm a terrorist" t-shirt.
Person 2: Man, that guy has got to be the biggest cock-prick on the planet!!
Person 3: Nah, the biggest cock-prick on the planet is the fuck that lives in the Whitehouse!!