Machismo was a behavior exhibited by some male Humans in the late 20th century. Males who exhibit this behavior would generally do physical acts of courage to prove their manhood.
In 1986, after Spock was caught swimming with George and Gracie, Doctor Gillian Taylor asked James T. Kirk if and his friend were into machismo. She said that if it was an expresson of machismo, she would be disappointed. Then, she expressed her dislike for macho males. (Star Trek IV: The Voyage Home)