dope, idiot, moron, wally, pillock, dunderhead, dimwit
by Jackson Pillock January 13, 2003
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the term plonker started out as a reference to someone who was forever drunk on cheap wine (cheap wine is nicknamed plonk) this person was usualy a homeless person, or poor person.

today the term plonker is a very light hearted insult. Its not even seen as an insult, its like calling someone a wally. Its in no way ment maliciously. you call someone a plonker when they say or do something stupid.
bob - why didnt my food cook ?
john - you never turned on the oven, you plonker.
by Emperor Bubba February 1, 2005
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A Plonker is typically some donkey who hangs around alley ways smoking the devils lettuce. He then shags his dad and sucks his toes.
by Turnip———-13 April 30, 2021
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A British slang term used as an insult meaning idiot. Usually used in an endearing way or when having a joke with someone
Person: you didn’t have to do that you plonker!
by Alex.tay09 July 12, 2019
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someone who is scared of and gets attacked by squirrels is a plonker.
by xJess. June 25, 2010
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