jim·my (jĭm'ē) n.
pl.jim·mies A short crowbar with curved ends. tr.v.
jim·mied, jim·my·ing, jim·mies To pry (something) open with or as if with a jimmy: jimmy a door.
[Probably from the name Jimmy, nickname for James.]
n. the penis. (From the proper name Jimmy or from the name for a short crowbar.) : The streaker covered his jimmy and ran across the field.
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition. Copyright 2007. Published by McGraw Hill.
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Word Origin & History
jimmy
1848, variant of jemmy, crowbar much used by burglars, special use of Jemmy, familiar form of proper name James (see jack).