Can be used to say that something is "cool", "awesome" or "amazing." Often people say it if someone does something risky or against the rules and does not fail.
Additionally, it is a name/nickname of a person who is downright amazing. He must have one of the smartest and nicest girls for a girlfriend, and he cares about her more than anything. Spending more than 3 days away from her would be torture to him. A real gentlemen, only truly lucky girls can get an Amendano. He looks beyond appearances, and at someone's personality. Knowing how to make you laugh, smile, and have a great time, they are truly unforgettable.
(Also they tend to be handsome, smart, and sometimes are teddy bears)
"Did you see him run across the street in the middle of traffic?" "Yo, he's such an Amendano; but he almost got hit!"
"Did you hear that she's dating Amendano?" "I'm SO Jealous, I wish I had a guy like that!"