The Collaborative International Dictionary of English v.0.48:

Gee \Gee\, v. i. [imp. & p. p. Geed; p. pr. & vb. n.
   Geeing.]
   1. To agree; to harmonize. [Colloq. or Prov. Eng.] --Forby.
      [1913 Webster]

   2. [Cf. G. j["u], interj., used in calling to a horse, It.
      gi[`o], F. dia, used to turn a horse to the left.] To turn
      to the off side, or from the driver (i.e., in the United
      States, to the right side); -- said of cattle, or a team;
      used most frequently in the imperative, often with off, by
      drivers of oxen, in directing their teams, and opposed to
      haw, or hoi. [Written also jee.]
      [1913 Webster]

   Note: In England, the teamster walks on the right-hand side
         of the cattle; in the United States, on the left-hand
         side. In all cases, however, gee means to turn from the
         driver, and haw to turn toward him.
         [1913 Webster]

   Gee ho, or Gee whoa. Same as Gee.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Gee \Gee\, v. t. [See Gee to turn.]
   To cause (a team) to turn to the off side, or from the
   driver. [Written also jee.] Geer

WordNet (r) 3.0 (2006):

gee
    n 1: a unit of force equal to the force exerted by gravity; used
         to indicate the force to which a body is subjected when it
         is accelerated [syn: g, gee, g-force]
    v 1: turn to the right side; "the horse geed"
    2: give a command to a horse to turn to the right side

Moby Thesaurus II by Grady Ward, 1.0:

19 Moby Thesaurus words for "gee":
   accord, bloke, boy, buck, chap, conform, correspond, dovetail,
   fellow, gent, gentleman, go, guy, harmonize, he, jibe, man, square,
   tally