Green’s Dictionary of Slang

1. the vagina; esp. in the context of cunnilingus [the bread roll / roll n. (1b)that holds a SE hot dog/hot dog n.¹ (3)].

1890–1904		Farmer & Henley Sl. and Its Analogues.
1928		Whittaker & Dorsey ‘It’s Tight Like That’ 🎵 If you see my gal, tell her to hurry home / I ain’t had no bread since she’s been gone / ’Cause it’s tight like that.
1931		Wesley Wilson & Harry McDaniels ‘She Shakes a Mean Ashcan’ 🎵 Her bread and her cabbage, it can’t be beat, / And she got the best jellyroll on the street.
1966		Trimble 5000 Adult Sex Words and Phrases.
1971		(con. 1920s) G.M. Foster Pops Foster 56: A good looking chick would come in the place, one of the guys would say ‘Gee, I know she’s got good bread’ [...] It meant she’s got good pussy.
1982		Maledicta VI:1+2 (Summer/Winter) 131: Bread (vagina, little used term now because of the hippies establishing that bread = ‘money’.

2. the penis [? dough’s rising when it is put into the SE oven / oven n. (1) or it being ‘the staff of life’].

1930		Bo Carter [song title] She’s Your Cook, But She Burns My Bread Sometimes.
1937		Roosevelt Sykes ‘Bread Pan (Just My Size)’ 🎵 She makes my bread rise late hours in the night, / I put my bread right in her pan / and I shoves it clean out of sight.