Gees is a colloquial expression or slang term used to describe enthusiasm, energy, or excitement. There are several synonyms that can be used in place of this word to convey the same meaning. Some of them include vigor, spirit, zeal, passion, liveliness, dynamism, vibrancy, ardour, and fervor. Other options could be animation, vitality, exuberance, pep, spark, or sparkliness. Alternative phrases may also include being fired up, pumped up, or amped up. By using these synonyms, one can add variety and depth to their vocabulary and effectively communicate their excitement and enthusiasm in a more varied and expressive manner.