Present participle of 'gee,' meaning commanding a horse to turn right or urging it forward with the word 'gee up.'
From the verb 'gee,' with the standard English progressive suffix -ing added to create the continuous form.
Old commands to horses are still with us in the -ing form—'geeing' and 'hawing' are verbs we still technically use, though mostly by people who still work with horses or in historical reenactments.
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