Someone who or something that pecks, striking or piercing in the manner of a bird's beak or bill, particularly:
(by extension of the sense ‘beak’) A nose.
(by extension, from the expression ‘keep one's pecker up’) Spirits, nerve, courage.
(chiefly in the plural) Short for peckerwood ("whitey; white trash")
(chiefly in the plural) Short for peckerhead ("dickhead; an aggressive or objectionable idiot").