gee up verb 2exclamation 1forms 3 verb2 •(slang) To encourage. •(slang) To excite in order to try to achieve a desired result."US fund manager Eric Knight has a fearful reputation as a shareholder activist, geeing up underperforming managements at Royal Dutch Shell and Suez." – HSBC: activist pounces, The Week, 15 September 2007, 631, 43. exclamation1 •move on!, go faster!Gee up, Dobbin, Gee ho, Dobbin, Gee up, Dobbin, Gee up, and gee ho - o - o! — 1850 formsgeed up · geeing up · gees up