dimmock

Noun

 * 1)  A foolish person; a dimwit.
 * 2) * 1990 January, "Pictionary" (video game review) in Your Sinclair issue 48, page 38
 * Well, first, to all the dimmocks out there, I have only one thing to say. Please take your felt tips AWAY from the TV screen. Right, now throw them away, you won't be needing them. You see, Pictionary comes complete with a nifty art package, needing only the addition of your fingers and a keyboard to originate the most splendiferous of graphic designs.

Etymology 2
Perhaps from.