HPOA Meaning?

Does anyone know the meaning of the term HPOA?
My friend is called that all the time and I have no idea what it means, is it related to her education?
Like when someone makes a drawing of her in class, they write HPOA but I don't know if it's an insult or a joke.
Can someone explain the term HPOA to me?

HPOA means "hot piece of a**"
Your friend is being called HPOA because she's probably hot. Don't take it as an insult, it's more like a compliment.
Someone who's called a HPOA should feel flattered for being a desirable woman, although some girls take it the wrong way.