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Wiktionary
gee-gee

n. (context colloquial usually childish English) A horse.

WordNet
gee-gee

n. a word for horse used by children or in adult slang

Usage examples of "gee-gee".

Bill but heard myself tell Johnny it was all right to follow Caz de Floon only minutes after that shithead shot Gee-Gee and Old Vertue.

Sparks is a horse player at heart and when he finds that Fatso is familiar with the gee-gees he becomes very friendly to be sure and supplies him with plenty of information and scandal about one and all in the best circles of Palm Beach and several surrounding spots.

I think that after you've played with the gee-gees you'll break out in a great gust and build a new empire much bigger than before.