Etymology
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pecker (n.)

1690s, "one who or that which pecks," agent noun from peck (v.); slang sense of "penis" is from 1902, according to OED "chiefly U.S." OED adds that the British colloquial sense of "courage, resolution" (in keep your pecker up, 1853) is "commonly avoided by British travellers in the U.S."

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Definitions of pecker

pecker (n.)
obscene terms for penis;
Synonyms: cock / prick / dick / shaft / tool / putz
pecker (n.)
bird with strong claws and a stiff tail adapted for climbing and a hard chisel-like bill for boring into wood for insects;
Synonyms: woodpecker / peckerwood
pecker (n.)
horny projecting mouth of a bird;
Synonyms: beak / bill / neb / nib
From wordnet.princeton.edu