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A galloper is someone who acts like a crazy horse that hasn't been tamed. They run wild through life like they're on a sugar rush and don't care who they step on.
My cousin is a total galloper. He ran into the kitchen screaming at the cat.
At the party, she was a galloper. No one could keep up with her.
He started a galloper streak at work. It ended when he threw a coffee cup at the boss.