The Collaborative International Dictionary of English v.0.48:

Jog \Jog\, n.
   1. A slight shake; a shake or push intended to give notice or
      awaken attention; a push; a jolt.
      [1913 Webster]

            To give them by turns an invisible jog. --Swift.
      [1913 Webster]

   2. A rub; a slight stop; an obstruction; hence, an
      irregularity in motion of from; a hitch; a break in the
      direction of a line or the surface of a plane. --Glanvill.
      [1913 Webster]

   3. A liesurely running pace. See jog[2], v. i.
      [PJC]

   Jog trot, a slow, regular, jolting gait; hence, a routine
      habit or method, persistently adhered to. --T. Hook.
      [1913 Webster]

WordNet (r) 3.0 (2006):

jog trot
    n 1: an easy gait of a horse; midway between a walk and a trot