The Collaborative International Dictionary of English v.0.48:

Jimmy \Jim"my\, n.; pl. Jimmies. [Cf. Jemmy.]
   A short crowbar used by burglars in breaking open doors.
   [Written also jemmy.]
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Jemmy \Jem"my\, a. [Cf. Gim, and Gimp, a.]
   Spruce. [Slang, Eng.] --Smart.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Jemmy \Jem"my\, n.
   1. A short crowbar. See Jimmy. [Chiefly Brit.]
      [1913 Webster]

   2. A baked sheep's head. [Slang, Eng.] --Dickens.
      [1913 Webster]

WordNet (r) 3.0 (2006):

jemmy
    n 1: a short crowbar; "in Britain they call a jimmy and jemmy"
         [syn: jimmy, jemmy]