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Noun: plonker  plóng-ku
Usage: Brit
  1. A stupid foolish person
    "blathering like the plonker that you are";
    - nincompoop, poop, ninny, nong [Austral, NZ], ning-nong [Austral, NZ], silly billy [Brit]
     
  2. [Brit, vulgar] Obscene term for penis

Derived forms: plonkers

Type of: member, penis, phallus, simple, simpleton