Green’s Dictionary of Slang

1. (also nest) the (female) pubic hair.

1595		Shakespeare Romeo and Juliet II iv: I must another way, To fetch a ladder, By which your love Must climb a bird’s nest soon when it is dark.
c.1707		‘Crab-Tree’ in Farmer & Henley Sl. and Its Analogues IV (1890–1904) 269/1: The Muff between her Haunches, Resembl’d much a Mag-Pye’s Nest Between two lofty Branches.
1756		Memoirs of an Oxford Scholar 180: [He combed her] downy nest back and forth, round and round in an avid passion.

2. the vagina.

1772		G. Stevens ‘The Sentiment Song’ in Songs Comic and Satyrical 125: Here’s the Nest in that Bush, and the Bird-nesting Lover; / Here’s Middlesex Bush-fighting, ---rest and recover.
1782		‘The Sentiment Song’ in Farmer Merry Songs and Ballads (1897) II 226: Here’s the nest in that bush, and the bird-nesting lover.
1840		‘A Song of Sentiments’ in Fake Away Songster in Spedding & Watt (eds) Bawdy Songbooks (2011) III 280: [as 1772].
1890–1904		Farmer & Henley Sl. and Its Analogues.

3. (gay) a hairy chest; of a woman, the breasts.

2003

B. Dark Dirty Cockney Rhy. Sl. 24: She’s got a nice boat race but a really tiny bird’s nest.

4. (US gay) visible pubic hair extending from the crotch to the navel.

1972

B. Rodgers Queens’ Vernacular.