Dick-edd and knob-edd have been my default insults since I was little, but i remembered yesterday that when I first learned these wonderful words I had a very clear idea of what I meant by it.
So, for you, does knobhead/dickhead give you the image of someone with a head shaped like an outsized cock--a cock where their head would be, essentially. If so, would it be anthropomorphic, with eyes and stuff?
Is a knobhead/dickhead somebody with a cock and balls attached to, and lolloping about on, their forehead?
I'll turn it into one of those this threads.
Also, any other phrases that have totally lost their original meaning to you, which now make you chuckle/fill you with nostalgic wonder?