It is the noun version of a person making a "dick" move. It is used when a person does an ignorant and/or diry action. Someone who is indeed worthy of dick, but in the bad way.
A term used by the lonely geeks in my Calculus class. Often used in the context of an attractive young male that they'd enjoy giving a nice buttfuck, hence the term 'dickworthy'. Ironically, most of them think that sex is the integral of e to the x.
"Man, that guy is suck a twink... Definitely dickworthy."