Equus -- but you have heard of Gee and Haw and giddy-up or even heard a slurred Gee'dyup, right?
Quote:Gee-Gee (dgi-dgi) a horse
...that was from the OED which had several literary references. It is described as a reduplication of Gee and was originally a children's term. First reference is BLACKMORE,
Lorna D, lxx -- "The Great Gee-Gee, as all the small ones entitled me."
Here's the entire quote from Lorna Doone:
Classic Reader website
Quote:Nevertheless, the way in which the children made me useful proved also of some use to me; for their mothers were so pleased by the exertions of the 'great Gee-gee'--as all the small ones entitled me--that they gave me unlimited power and authority over their husbands; moreover, they did their utmost among their relatives round about, to fetch recruits for our little band. And by such means, several of the yeomanry from Barnstaple, and from Tiverton, were added to our number; and inasmuch as these were armed with heavy swords, and short carabines, their appearance was truly formidable.