Green’s Dictionary of Slang

1. the penis.

1300–25		in Reliq. Antiq. II 211: Ye ne may no more of love done, Mi pilkoc pisseth on mi schone [F&H].
1598		Florio Worlde of Wordes n.p.: Dolcemelle, [...] Also taken for a mans pilicock.
1605		Shakespeare King Lear III iv: Pillicock sat on Pillicock Hill.
1611		R. Cotgrave Dict. of Fr. and Eng. Tongues n.p.: Turelureau. Mon tur. My pillicocke, my prettie knave.
1653		Urquhart (trans.) Gargantua and Pantagruel (1927) I Bk I 44: One of them would call it her pillicock, her fiddle-diddle, her staff of love, her tickle-gizzard, her gentle-titler.
c.1707		‘Pillycock’ in Farmer Merry Songs and Ballads (1897) III 87: So bolt upright and ready to fight, / And Pillycock he lay there all Night.
1719		in D’Urfey Pills to Purge Melancholy IV 311: So bolt upright and ready to fight, / And Pillycock he lay there all night.
1786		Burns ‘Here’s His Health in Water’ Merry Muses of Caledonia (1965) 101: He followed me baith out an’ in, / Wi’ a stiff stanin’ pillie.
1879		D. Adams Shakspeare’s Works (Howard) 1216: Note on Pillicock... Lear’s mention of his pelican daughters suggests this word – a cant term of familiar licentiousness – to Edgar [F&H].
1890–1904		Farmer & Henley Sl. and Its Analogues.
c.1904		A. Crowley Snowdrops from a Curate’s Garden 24: Let us lerricompoop! said Wilhelmina, in a voice thick with lust and marred by Martin’s pillicock, which was tickling her tonsils.
1925		E. Field ‘A French Crisis’ in Facetiae Americana 20: Your pillycocks are competent for tickling mouse’s ears.

2. a term of affection for a young boy.

1598		Florio Worlde of Wordes .
1611		in R. Cotgrave Dict. of Fr. and Eng. Tongues n.p.: Vitault: m. a flattering word for a young boy, like our, my prettie pillicocke.
1653		Urquhart (trans.) Rabelais I xli: By my faith, saith Ponocrates, I cannot tell, my pillicock, but thou art more worth than gold [F&H].