dodge knocker

noun (doj noker)
1. A person, usually male, that is held in low regard due to their lack of common decency, conscience and integrity.
2. A shifty, sly person

Origin:
1990-2005. A compound word describing the closeness of someone to dodgey, i.e. knocking on the door of dodge.

That guy is trying to get that girl so wasted so that she will sleep with him, he is such a dodge knocker,

or,

Look at that guy, he used his mobile to look up answers at the trivia night, what a dodge knocker.