A low level cad person who makes edits with no regard for or knowledge of proper production methods or standards.
Personally I think thats a load of rubbish. A CAD Monkey can be a highly skilled operative with years of experience.
I happen to prefer this definition though:
A whoring draftsman using computer aided design (drafting)
"Look at that cad monkey make magic with a mouse!"
Much much better.
There you go, not only am I a CAD Monkey, I am also a CAD Whore.