Etymology
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jellyroll (n.)

also jelly-roll, "cylindrical cake containing jelly or jam," 1873, from jelly (n.) + roll (n.). As slang for "vagina; sexual intercourse" it dates from 1914 ("St. Louis Blues").

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Definitions of jellyroll

jellyroll (n.)
thin sheet of sponge cake spread with jelly and then rolled up to make a cylindrical cake;
Synonyms: Swiss roll
From wordnet.princeton.edu