Definition of geeing:
(n) :
A gee-gee, a horse.
(n) :
(US, slang) A guy.
(v) :
(intransitive) Of a horse, pack animal, etc.: to move forward; go faster; or turn in a direction away from the driver, typically to the right.
(v) :
(transitive) To cause an animal to move in this way.
(n) :
The name of the Latin-script letter G/g.
(n) :
(Ireland, slang) Vagina, vulva.