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Definition of plonker noun from the Oxford Advanced Learner's Dictionary

plonker

noun
 
/ˈplɒŋkə(r)/
 
/ˈplɑːŋkər/
(British English, slang)
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  1. a stupid person
    • You’re a right plonker.
    Word Originmid 19th cent. (as a dialect word meaning ‘something large of its kind’): from the verb plonk + -er.
trait
noun
 
 
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