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pillock (n.)

"the penis," 1530s (mid-13c. as a surname), dialectal variant of Middle English pil-cok, pillicock "the penis" (see cock (n.3)). Meaning "stupid person" is attested by 1967.

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Definitions of pillock

pillock (n.)
a person who is not very bright;
Synonyms: stupid / stupid person / stupe / dullard / dolt / pudding head / pudden-head / poor fish
From wordnet.princeton.edu