Green’s Dictionary of Slang

1. the head.

1646

T. Fuller Andronicus in Farmer & Henley Sl. and Its Analogues I 142/2: Often the cockloft is empty, in those whom nature hath built many stories high.

2. the vagina.

a.1731		N. Ward ‘Elegy upon Gammar Bouncly’ in Miscellaneous Works IV 172: [She] many a youthful Swain has eas’d, And in her Cock-loft, jolly Tinker pleas’d.
1790		M.P. Andrews Better Late than Never 41: What, my dear Mr Flurry up in the cock loft.
1890–1904		Farmer & Henley Sl. and Its Analogues.
1985		‘Jennifer Blowdryer’ Modern English 72: genitalia: female (n): Cock loft.

3. the penis.

1832

Satirist (London) 21 Oct. 341/4: it was soon discovered' that the maids’ kitchen and the tailors’ cock-loft were upon vsiiting terms.