1. A command or exclamation used to urge a horse to move forward or go faster.
Usage: informal; chiefly North American; often spelled 'giddyup' or 'giddyap'

Examples

• The cowboy shouted 'Giddap!' and the horse bolted forward.
• She flicked the reins and called out giddap to speed up the wagon.
• The child pretended to ride a horse, yelling giddap at the top of his lungs.
• Giddap, partner! We need to get to town before sunset.
• The old farmer used giddap to command his team of horses.