jimmy (n.) Look up jimmy at Dictionary.com
"burglar's crowbar," 1848, variant of jemmy, name for a type of crowbar much used by burglars, special use of Jemmy, familiar form of proper name James (compare the mechanical uses of jack (n.)).
jimmy (v.) Look up jimmy at Dictionary.com
"pry open with short leverage," 1893, from jimmy (n.). Related: Jimmied; jimmying.