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It comes from the Italian word 'Gagliardo' which means 'super strong' like a bull in a china shop and a beast in a bedroom.
My uncle is a Gagliardi. He can bench press a cow and still have time for my sister.
The pizza man is a Gagliardi. He eats two pizzas at once and still has energy for a dance-off.
My dog is a Gagliardi. He can bite through a shoe and still beg for more treats.