Given that you naughty, naughty people got my thread - Plonker - a definition, locked, I thought I'd try with another one.
This is the word "pillock" which is the word that pre-dates plonker. Certainly we used this in our youth back in the sixties here in London, England. Indeed it often worries me when I see "plonker" used here to recall that we didn't use it. Plonker is a relatively new word. We used "pillock".
Pillock has exceptionally similar meanings to the oft-used plonker. Meaning number 2 below is what should concern us.
Here is the OED again.
pillock n.
1. orig. Sc. The penis. Now Eng. regional (north.) and rare.
1568 D. LINDSAY Satyre (Bannatyne) 1491 in Wks. (1931) II. 388 Me think my pillok will not ly doun.
1900 W. DICKINSON & E. W. PREVOST Gloss. Dial. Cumberland (rev. ed.), Pillick, the male organ. 2000 Northern Echo (Nexis) 15 Mar. 13 Jack Dent in Northallerton recalls a rhyme touring the school yard ‘when I was a small boy’... Why did the butterfly flutter by? Because she saw the caterpillar wave his pillock at her.
2. Chiefly Brit. colloq. (mildly derogatory). A stupid person; a fool, an idiot.
1967 J. BURKE Till Death us do Part viii. 135 What are you talking about, you great hairy pilloch? 1978 ‘J. GASH’ Gold from Gemini vii. 70 The pillock mistook my astonishment for awe. 1995 FourFourTwo Oct. 146/2 (advt.) What a bunch of pillocks! 2004 Rugby World Feb. 49/1 Those mindless pillocks in New Zealand who slated England for the way they played in Wellington in June.
(Any chance of a sensible debate please, without the foul language of the weekend.)