A fat-ass who was the king of the persians 2.400 years ago, who couldn't do anything. He leaded the Persians in the battle of Thermopylae and he only managed to kill the 300 spartans and the 700 thespians because of that bitch Ephialtes, who showed the persians the path which leaded behind the greeks. He is also that fat guy at meet the spartans who is less fat and gay than the real one. It can also be an insult.
"Xerxes is a dumbass"
"You are such a Xerxes!"