Green’s Dictionary of Slang

jelly roll n.

[? jelly n.1 ; note earlier chronology here; SAmE jelly roll, a doughnut, which has a hole at its centre]

1. [20C+] (orig. US black) sexual intercourse; also attrib.

2. [1910s+] (orig. US black) a lover, a spouse; also attrib.

3. [1910s+] (orig. US black) the female genitals; thus jelly roll gum drop, the clitoris.

4. [1950s] (US) a male hair style, popular in the 1950s.

5. [1970s+] (US black) a sanitary napkin.