THAT'S IT! interjection denoting approval or recognition. It corresponds to a Spanishization of the famous Eureka! of Archimedes, when in his bathtub he discovers archimedes' Principle, in which the thrust (force) is equivalent to the weight of the liquid dislodged by the submerging body.
* Only one "like" per meaning and day, the more "likes" the meaning will appear higher in the list